Category Archives: sewing

CUPS of SOUPS

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After sewing mostly quilts for a while, I was inspired to sew a dress again last summer (2022) because I wanted a dress to wear to the Symposium On Usable Privacy and Security (SOUPS) 2022, a conference that I started in 2005 and is still going strong. I thought it would be fun to have a dress that had soup on it. I thought about a soup-can dress channeling Andy Warhol, but eventually settled on a bright noodle soup pattern called grandma’s recipe, designed by Daniela Friedenthal and available at spooflower.com. I had the fabric printed on modern jersey, and then tried to figure out how to sew it.

Sidebar 1: I love Spoonflower modern jersey! It is one of the best polyester jersey’s I have found with a feel similar to cotton, but brighter colors. It is similar to double-brushed polyester (DBP) but has a little bit more body than most of the DPBs I’ve used. The main downside is it is about 4 or 5 times more expensive than DBP and only available for custom printing, not colored solids.

My previous me-made dresses were very simple, sewn from two pieces of fabric with no pockets. This time I wanted a half-circle skater dress with pockets and some better finishing details. I started reading sewing blogs and learned how to sew side-seam pockets and create neck bands and bindings and make smooth knit hems with Soft Stretch hem tape. I reverse engineered some dresses from my closet and drafted a pattern, trying to include enough ease so I wouldn’t need a zipper.

Sidebar 2: I also love Heatnbond Softstretch for knit hems of all sorts. I fuse the tape to the edge of the hem, turn under the hem and press using the paper backing edge as a guide, then peel back the paper and fuse the hem in place, then zigzag over the edge. I’ve used this on dress, shirt, sleeve, and cardigan hems with great results. It even works on curves — you just have to nudge the paper backing around the curve as you press it. I now keep a couple of rolls around at all times so I don’t run out in the middle of a project!

The finished dress worked pretty well. The waist ended up a bit looser than I wanted and the pockets pulled the waist down a bit when I put stuff in them. But a sweater easily hides the imperfections. It is a fairly striking looking dress because of the unique fabric, and I have had total strangers comment on it.

While I wasn’t 100% satisfied with the SOUPS dress, I decided it was good enough that I wasn’t going to remake it. But I wanted to improve my pattern and give it another go. So adjusted the fit of the waist and the pockets a bit and sewed the dress again, this time in soft blue vintage tea cups fabric designed by Cecilia Mok on spoonflower.com. I chose cups because the name of my lab at CMU is the CyLab Usable Privacy and Security (CUPS) Laboratory. I also went on a quest to find a spoon pendant I could wear with both dresses. Most of the spoons I could find online were either too tiny or too big, or were designed for functional use as drug paraphernalia. I eventually bought a 25 pack of spoon charms for less than $10.

The CUPS dress came out considerably better, but in my further reading about sewing skater dresses, I discovered a free PDF skater dress pattern from Sinclair Patterns. Then I discovered Sinclair’s other patterns and one thing led to another. Watch for future blog posts….

Projector sewing – this is a game changer!

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When I started sewing clothes again last summer I read lots of sewing blogs and joined some sewing-related Facebook groups. I bought some PDF patterns (and downloaded some free ones) and printed them out and taped them together. It took a while to tape them all together and get ready to sew, but it was still more convenient than having to go to a store to buy a physical pattern or wait to have it shipped. But I noticed that some of these patterns came with “projector files” and people in the Facebook groups were talking about projecting their patterns. Intrigued, I started reading up on projector sewing and found a great projector sewing website with lots of good information about how choosing a projector, mounting it, calibrating it, etc.

For my birthday last February, I decided to get an inexpensive projector and asked my husband to figure out how to mount it. I selected an inexpensive Alvar mini-projector, which weighs less than 4 pounds, and has wifi and bluetooth. It was on sale for $87. My husband didn’t want to drill holes in the ceiling, so he bought me a 15-pound microphone boom stand to mount the projector on. It was difficult to level the projector that way. So we added a tripod ball head so we could easily adjust the projector to be level with the tabletop. With this setup, my projector is suspended about 61 inches above my tabletop.

I put my cutting mat on the table, connected my laptop to the projector via bluetooth, and projected a pattern and started cutting it out with a rotary cutter. I discovered that the projected image kept freezing periodically, which got kind of annoying. After some trial and error and reading advice on the Projectors for Sewing Facebook group, I switched to projecting from my iPad instead, which solved the freezing problem. I bought Affinity Designer (AD) for my iPad to use for editing and projecting patterns. Calibration was a bit tricky, but I used the calibration tool and followed the instructions on the projector sewing website. It has been three months since I calibrated and the calibration seems to be holding fine. Another problem I ran into was my table wobbled a bit, especially when I leaned on it while cutting. I tightened up all the bolts in the table legs and now my table doesn’t wobble.

sewing projector setup

Initially I used a set of large washers I bought at a hardware store to hold my fabric in place while cutting. But I noticed some of the projector sewing folks talking about magnets. It had never occurred to me that you could put metal under a cutting mat and magnets would stick to it. I went to Home Depot and bought two of the least expensive 24×36 galvanized steel sheets I could find (about $15 each). I duct taped them together and added tape around the sharp edges so I wouldn’t cut myself. Then I slid them under my cutting mat. I bought a box of 25-lb rare earth magnetic hooks to hold down fabric. The magnets are strong enough to hold multiple layers of fabric. And the hooks are nice for easily grabbing and lifting the magnets.

galvanized steel for sewing table
galvanized steel for sewing table duct taped together

I use Crayola washable markers or white pencil (for dark fabric) to mark notches, darts, etc. on fabric, traced off the projected image.

Some of the PDF patterns I wanted to use were not designed for projecting. But I discovered PDFStitcher, which is free software, developed by a sewist, that stitches the pages of PDF files together. It also has some extra features such as allowing you to thicken and change the colors of lines, or select only the size layers you need. It works great!

Projector sewing is definitely a game changer! Now that I have this setup I don’t want to go back to paper patterns. For patterns that don’t require any alterations, I can quickly project, cut, and sew. For those that I want to modify, I’ve gotten fairly proficient at adding annotations to patterns on my iPad with AD and can use this approach to quickly lengthen, shorten, grade, change the neckline, etc. without having to cut and tape pattern pieces. I can even create pattern mashups, cutting and pasting elements from one pattern to another. This works even with dark fabric. The projector is usually bright enough, even without covering the window in my sewing room, although I do usually turn off the overhead light when using it. For cutting pieces that are larger than the projection area, I cut part of the pattern and then slide the image and cut the rest of it. You can add an alignment mark to the PDF and mark it on the fabric to make this easier.

Another projector trick is to draw or alter pattern pieces by placing a physical object (e.g. a pocket) on the table where the image is projected and drawing it on the iPad. You can see the projected drawing on top of the real object and adjust the lines of the drawing until they align with the real object. This is a good way to copy elements of exiting clothes or to add adjustments previously made on paper patterns to the PDF patterns.

October 2024 Update: I realized I was leaving pixels literally on the table, which was annoying when it meant that I couldn’t cut a whole pants leg without shifting the fabric. My table and cutting mat are big enough (especially since I’m short and my pants are not that long), but the projected image was not. I started by adjusting my tripod and raising my projector a few inches until it hovered just below the ceiling. That got me a couple more inches in my projected image, but still not enough. I noticed that when I turned my projector on it projected a 16:9 image but when I connected my iPad to it the image was only 4:3. Thus I was not using the full length of the image. I had switched to my iPad rather than my laptop because when I first started projector sewing my laptop caused the projector to freeze. However,16 months later I have a new laptop and am using Affinity Designer on my laptop too so I decided to try the laptop again. This time no freezing, and I was able to project a 16:9 image and use the full length of my cutting mat and cut each pants leg in one go!

Modern approach to sewing a vintage sundress

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I asked my 17-year-old daughter what she would like me to sew for her. After perusing some patterns I suggested she told me what she really wanted was a vintage sundress in a woven fabric with a full-circle poofy, twirly skirt, perhaps like the one she had recently seen worn as a costume in Carnegie Mellon’s student production of Godspell. (See photo below of said costume on display at the CMU carnival.)

So I visited all my favorite PDF pattern websites and found some candidate patterns, but none were quite what she was looking for. I searched the Internet for vintage sundress patters with circle skirts and found a number of patterns from the 1950s that were available from resellers as classic paper patterns. And then I stumbled upon McCall’s M7599, which has been reissued as a PDF pattern. I found some reviews of the pattern, and even a how-to video (and I found another video after I finished sewing that might have been useful to watch too). My daughter examined M7599 and decided that view A was almost perfect. Except she wanted it without the contrast band, above knee length, and, of course, with pockets. These seemed like doable modifications, so I bought the pattern and downloaded the PDF.

The PDF pattern came with a fairly terse set of instructions and was basically a scan of the original pattern with all the layers on one sheet, tiled into 8.5×11 pages, not a convenient modern PDF layered pattern. I was able to assemble the pages into one giant PDF using PDFStitcher, an awesome free tool developed by a sewist. Then I loaded the resulting PDF into Affinity Designer (AD) on my iPad and traced the pattern pieces I was going to use in the correct sizes with a nice thick red line that would show up well when projected onto fabric (see photo below of skirt gores projected on fabric, held in place with magnets, ready for cutting with rotary cutter).

The sizing of vintage patterns is strange. My daughter normally wears a 2 or 4 dress size but according to the size chart she needed a 12. Ultimately after making a muslin and futzing with the pattern I ended up making a size 10 with parts graded to a size 8.

Inspired by the Godspell costume, my daughter searched online for fabric with pages of text, and ultimately settled on the Filigree Zen Chic Newsprint Text and Words fabric from Moda Fabrics in the white colorway. It is a lovely quilter’s cotton fabric, but it occurred to me that it is quite directional and the circle skirt would result in some of the design being upside down. To compensate I divided the full circle into six gores so that I could cut them each right-side up. I drafted the gores directly on the PDF pattern in AD. Of course, this increased the amount of fabric I would need — I ended up using six yards!

Removing the band from the bodice was straightforward — I basically just sewed the pattern as written but without attaching a band. I decided to also leave off the petticoat so that my daughter would have the option of wearing the dress either with or without a petticoat (she can wear a separate petticoat). Since I wasn’t attaching a petticoat I decided the yoke under the petticoat wasn’t needed either so I left that out as well.

I made a muslin of just the bodice so I could adjust the fit. I reduced the size of the bust darts, and brought the straps in a bit. It was also a good opportunity to practice using my zipper foot, which I haven’t used in many years (and zippers kind of scare me). It turned out to be a nice enough crop top that my daughter decided to wear the muslin outside in public. In fact she even wore it to perform with her rock band. She requested thinner straps for the dress and I decided to continue futzing with the bust darts, and ultimately just removed them altogether for the dress.

Figuring out how to implement side-seam pockets was another challenge, as the pattern includes a side zipper, which means the zipper has to attach to the pocket. Fortunately I have a RTW dress with pockets sewn this way so I used it as a model. I drafted pockets in AD and then reverse engineered how to sew it all together. (There are actually instructions online for sewing a pocket in a zipper and a nice video that I will probably watch if I ever attempt something like this again.) This isn’t the most beautiful invisible zipper job, but it doesn’t look terrible, and both the zipper and the pockets are fully functional so I consider it a win.

The penultimate step in the pattern involved slip stitching the bodice lining to the zipper and then to the skirt. Until I reached that step I didn’t fully comprehend how that final finishing would be done or realize how much hand sewing was involved, but I got through it and it turned out fine. The final step was the hem. I knew my daughter wanted the skirt quite a bit shorter than the pattern called for so I had cut it shorter in anticipation. But I hadn’t cut it short enough and it would have required a 2.5 inch hem, which was going to be hard to sew on a circle. So I folded the skirt into quarters and carefully lopped off 1.5 inches with my rotary cutter. Then I sewed a line .5 inch from the edge of the circle all the way round. This allowed me to easily fold the skirt on the stitch line and then fold it again and press to form a 1-inch hem. I stitched the hem down with a straight stitch about 1/8 inch from the edge of the hem. All this was reasonably straight forward but I would like to point out that the circumference of this skirt was about 12 feet, which means that each step (stitching, folding, folding, pressing, stitching again) has to be done over a distance of 12 feet, so it takes a while.

Other than figuring out the bodice fit adjustments, sewing the zipper pocket, and all that hemming, the dress actually came together pretty quickly and wasn’t that difficult to make. And the results are pretty nice. Here it is modeled without a petticoat. (And below that, while performing at her music recital.)

And here it is with petticoat, in full 1950s glory!

Password fashion and home decor roundup

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Bad password fabric

I’ve been collecting images of all the cool things that I and others have made with my bad password fabric. The fabric is available from Spoonflower in three size and both with and without the naughty words. It has a purple background and includes 501 passwords. Spoonflower offers a variety of different kinds of fabrics, including a performance knit, basic cotton, and faux suede. They also will print this design on wrapping paper and wall paper.

Bad passwords dress (Security Blanket quilt in background)

Recapping for those who are just seeing this, I designed a series of bad password fabrics based on the most popular passwords stolen in a Rockyou.com data breach. First I made a “Security Blanket” quilt printed on basic cotton fabric in pastel colors. This quilt appeared in Science Magazine and was on display at the residence of the Carnegie Mellon University president for most of last year. Then I designed a purple version of the fabric and made a password dress with performance knit fabric. The dress has gotten some nice press on CNET, the Trib, and the Women you should know blog.

Then my friends started requesting other password apparel. Mary Ellen Zurko commissioned my friend Jen Primack of Upcycled Designs to make her a t-shirt from cotton knit fabric. Then Jeremy Epstein asked for ties, and we found Jen Knickerbocker of LoveCrushDresses and got her to offer regular ties and bow ties in her Etsy shop. The ties are made from cotton sateen.

Bad passwords t-shirtbad passwords tiesbad password bow ties (two)

Then Jen Primack bought an old chair and reupholstered it with my passwords fabric in heavy cotton twill. Doesn’t it look great in my living room?

password chair upholstered by Jen Primack password chair upholstered by Jen Primack

Kristin Briney emailed me to tell me she had made a password dress from cotton poplin. And I just made a password infinity scarf from silky faille (a woven polyester).

Kristin Briney's bad password dresspassword infinity scarf

Password baby quilts and couch throws made out of kona cotton are coming soon….

In the mean time, I’ve gotten many requests to wear the password dress to events. I wore it to give an invited talk at the 2014 Grace Hopper Celebration of Women in Computing (where I was referred to as a “password researcher and fashion idol“). I also wore it to a couple of briefings I gave to Congressional staff on Capitol Hill.

Lorrie speaking about passwords at Grace Hopper Celebration Lorrie with Jeremy Epstein wearing password apparel Susie, Lorrie, and Roxana at NSF Congressional briefing

And for those wondering about the different types of fabric. The polyester fabrics are much brighter than the cottons. They are all fairly consistently bright with nice saturated colors. My favorite is the performance polyester, which doesn’t wrinkle and has a little bit of stretch and a nice drape. But it’s not really what you want to use for a quilt or a tie. The kona cotton is a little disappointing because the colors print a little dull. The basic cotton (which is similar to the kona but slightly lighter weight and less expensive), cotton sateen, and the heavy cotton twill produce brighter colors. They aren’t as bright as the polyester, but they are noticeably brighter than the kona cotton. The cotton silk also does not produce bright colors. I think the polyester silky faille might work well for ties and some other applications where you might otherwise use a woven cotton but want brighter colors. It’s a little slippery and harder to work with than cotton though. I got samples of the polyester faux suede and polyester eco canvas. They are both lovely bright fabrics, but I haven’t made anything out of them yet.

1/22/15 update: Von Welch, Director of the Center for Applied Cyber Security at Indiana University Bloomington wore his Password tie for a local TV interview. The reporters loved the tie and commented on it at the end of the interview.

2/6/15 update: Baby quilt in kona cotton finished!

DSCF7245 DSCF7251

7/16/15 update: I made a password bolster pillow for the CMU ECE department head’s conference room.

DSCF0090 DSCF0097

6/28/20 update: Given current circumstances, password masks were required! I printed my design XX small on cotton spandex jersey and lined the inside of the mask with fabric from an old cotton spandex t-shirt (outer layer and lining each cut 10.5 x 5.5 inches; sewn together at top and bottom; left and right sides folded in and stitched to make a casing on each side; long 1-inch strip of stretchy t-shirt fabric pulled through the two casings and tied to make 2 loops to go around the back of the head). Spoonflower also sells masks already made (and lots of other things) for those of you who don’t sew. This link at Spoonflower might work: https://www.spoonflower.com/en/products/2126447-bad-passwords-clean-edition-xxsmall-by-lorrietweet?product=homegoods-kitchen-dining. See also the images and links at https://www.secmeme.com/2020/06/bad-passwords-face-mask.html.