How to make a corset - Simplicity 9769
Part I - Mock-Up(s)
Step 1. Research
From the many corset-making sessions I've attended, I believed making a fitted corset was like climbing Mt. Everest alone, with no shoes. I wasn't far off. The construction itself isn't that bad, but getting the right fit is a chore. I knew from the start that I wanted as much information as possible before I made my own. So I'll include some of the many resources I used along the way.
I chose the Simplicity 9769 corset pattern since folks seem to think it is the least historically inaccurate of the corset patterns from the Big 4 pattern makers. And I already had it and probably paid $0.99 for it. I figured it would be good practice before I spent significantly more on a fancy pattern such as Laughing Moon. After choosing the pattern I looked it up on the Pattern Review website. Very helpful advice on this corset. The pattern does indeed run way too big, so be prepared to make one several sizes smaller than you think you need.
I also checked out the uber helpful Corset Makers page on Live Journal. The indexed topics are great. They even have a topic just for this Simplicity pattern. Farthingales also has some tips about this pattern. Your Wardrobe Unlock'd has a great corset construction tutorial. I didn't draft my own pattern, but some of the construction advice was helpful. I used several other sources along the way, but you should do your own searches as well as there is a great deal of information out there about making corsets. Also consider the purpose of your corset. Mine is being made as an undergarment for costuming, so no one will be seeing it.
There are many sources for corset supplies. I've purchased boning and eyelets from eBay before. Chain sewing stores have limited supplies (don't get one-piece eyelets) and don't carry steel boning or busks. This time, since I needed a busk, I ordered from Corset Making Supplies. The shipping is higher than I like, but I was able to get eyelets (grommets), boning, boning tips, and busks into one shipping charge - making it comparable to piece-meal puchases on eBay. Walmart and Michaels often have two-piece eyelets that work well when set properly. Be sure to research the proper method of setting eyelets/grommets. Get yourself an awl if you don't have one. Also, if you plan to wear this corset as outerwear, be wary of the store-bought black eyelets. I have found that the "paint" comes off too easily when setting them. I ordered black eyelets from Corset Making Supplies to see if theirs are better.
Step 2. Mock-up
Everyone recommends making a mock-up out of muslin, also called a toile. Even though I knew the pattern was going to be too big, and probably too short, I decided to make the mock-up from the size I thought it would be, just for practice. Cheap thrift-store muslin, free plastic banding for bones, and casings from muslin fabric. I did end up making my own re-usable eyelet strips from sturdy canvas-like fabric. I can use them over and over with other mock-ups. I did not put the busk in to the first mock-up. I just stitched the front pieces together with a tight zig-zag stitch. To save twill tape for this first run, I just used 1" strips of the muslin fabric for the bone casings. My final version will likely include a lining fabric and won't need casings, but it is good to practice.
The lumber at Home Depot is strapped down with plastic banding that makes excellent plastic boning. They just throw it away and are willing to let you have however much you want. I used sharp scissors from our garage to cut the pieces to length and then in half (they are 5/8" wide). I have heard that people use this in their bodices, and sometimes in their corsets if they don't need it too curvy. Heavy cable ties are also a cheap substitute for steel boning. Do your research about which boning you need to use in the final version.
Based on advice at the above-referenced sites, I did not flat-fell the seams. I pressed them to the appropriate side according to the instructions, and trimmed them to 1/8". The casings will then be centered on the seam line and I won't have to worry about matching up stitching lines. I did double stitch (lock stitch) each seam using 2 different stitch lengths. Another tip I read was to use spring steel boning at the back, near the eyelets, instead of spiral steel.
So the mock-up was waaaaaayyyyyyy too big. But I did discover that I made a common mistake - I had a few pieces bottom side up. The pattern pieces do look "blocky" so be sure to mark the top of each piece of the pattern as you cut them. I did this by making a mark with a red pen in the seam allowance at the top of each piece.
For the next mock-up, I decided to take my measurements and compare them with the actual measurement on the pattern piece (exlcuding the seam allowances). I decided how much "squish" I had in my chest and waist and how much extra could come off each measurement. After I compared that to the actual pattern measurements, I decided to go down 2 sizes in the chest and 1 size in the waist/hips. My goal was not to take many inches off my waist. I simply wanted to make a costuming undergarment that will smooth things out. I was not interested in being uncomfortable just to make my waist smaller. I could have taken much more off the waist, but opted for comfort this time.
I also needed to add 2 inches to the pattern. The first mock-up hit right above my hips and right at my nipples. (I don't consider myself long-waisted, but just about every top pattern I've used has to be lengthened.) I cut the pattern pieces at the waist line (see note below) and spread them 2 inches, taping the 2 pieces to blank pattern paper. I then re-drew the pattern lines to fit the two different sizes I am using.
*Note on waist line - The waist line is marked only on the center front and center back pieces. It is helpful to mark the waist line on all pieces if you are going to alter it. A tip I found on-line is to take the center front piece (13) and place the front piece (14) on top, matching notches and making sure grain lines are parallel. Then mark the waist line on piece 14. Continue with each pattern piece. When you get to the center back piece (19) redraw the waist line based on piece 18. For some reason, the waist lines don't seem to match up on 13 and 19. Maybe it's just me?