Probably one of the most challenging things to make in Princess Leia Costuming is the grey vest that she wears in the briefing room just before going to Endor in Return of the Jedi (and seen post battle as she is getting her arm bandaged indicating that she has this vest on under the camouflage poncho the entire time). This cap sleeved vest style is also seen in the movie Ewoks: Battle for Endor on Paul Gleason's character Jeremitt Towani. (Perhaps indicating that he was involved in Rebel activity at some point?)
I made my first pattern by draping a mannequin but the fit was not great. So I made this second pattern using a bodice sloper that I flat drafted following instructions in the book "Apparel Making in Fashion Design" by Injoo Kim and Mykyung Uh. You can find it on Amazon and if you sew a lot and want to make your own patterns, I strongly suggest you buy it. The bodice drafting instructions are on pages 24-29. You will also want a Variform ruler for the curved edges like the neck, arm holes, and cap sleeves
After making the sloper I moved all of the bust dart space to the waist to be gathered (see page 200). I also moved the shoulder dart to the back waist to be gathered but I probably should have moved it into the yoke area (much like the shoulder dart closure suggested on page 233). I still got a good fit out of this pattern though.
Once I had the dart space moved I was able to trace new slopers and create yoke pieces, pockets, etc. and add 5/8" seam allowances.
I do not know anything about enlarging patterns so the best I can do is say that this pattern was made for a 39" bust, 28" waist, a back length of 18", and a shoulder length of 5". Also the bust point was measured at 11.5" from the shoulder. I am about a size 6/8 with a long waist. I did have to shorten the the length on the bottom of the vest before I was done though, more on that later. All I have for now is sharing my pattern pieces with notes and the dimensions. Unfortunately I get so focused on the sewing process I forget to take step by step photos.
It is important to already have your pants and blouse for this costume done if you are making it for the Leia costume. You need to take a final waist band measurement from just below the waistband of your pants while wearing them and you will need to see where the cap sleeves are over the pockets on the shirt sleeves. Most of the pocket should be visible and I was able to create this final sleeve pattern (after much drafting and re-drafting) by seeing the vest on over the blouse and deciding how long the cap sleeve should be. Cap sleeves are hard, you may need extra fabric for re-doing the sleeves and waist band.
I suggest using Google to find as many images of this vest as you can, there is a lot of top stitching involved.
I made my vest from a medium grey Kona cotton from Joann's, it took 2.5 yards But you may need extra if you mess up the sleeves and waistband as I did). Most of these pieces you will be cutting 4 of unless you only line the yoke. Everything has a 5/8" seam allowance except the cap sleeves and I noted this on the pattern piece.
Lastly, I have not submitted this costume to Rebel Legion yet so I have no idea if my final vest will be approved.
Attach the two yoke backs to the two vest backs and iron flat. Now you can attach a left and a right vest front at the shoulders to a vest back a repeat this with your other three vest pieces. Be sure to press the shoulder seams. Line up the bottom edges of the pockets to your outer vest fronts, and pin in place (remember that the narrow sides go in the side seams). Close up your outer vest side seams, then close up your lining side seams and iron all of these seams flat. At this point you should have two unfinished vests, one with pockets and one without (this is your lining).
You will want to sew the shoulders of your yoke batting pieces together now, but do not iron them. Put the right sides of your vest and lining together matching up the neck and front opening edges, place the batting on one of the wrong sides and pin in place. You want to seam from the bottom opening edge corner, up to the neck, around the neck, and back down the opposite opening edge to the bottom. Then carefully clip the corners and the neck, flip vest right side out (the batting should be between the outer fabric and the lining now) and press this seam flat but try not to press the batting in the center, just along the seam edge. Batting will flatten and fuse when its ironed and you need to wait until you've made the top stitching on the yoke to press the whole thing.
Now you need to check the vest length. It is best that you have your pants for this costume ready as you want the waist to overlap the waist of the pants. Don't forget that this has a finished waistband that is 1.5-2" wide which adds additional length to the finished vest. I had to take slightly less than 2" out of the length shown on the patterns here before I was done. (There was a lot of waist band adjustments before I was done).
I prefer to top-stitch the yoke quilt lines at this point to hold everything together. You should make these lines in something that will wash out or is iron erasable, I used pencil. Always top stitch on the outside of the yoke, the lining could be slightly off. I also leave long ends of thread and do not back stitch but use the extra thread length to finish the top stitching by hand with a needle, I just think this looks cleaner. For the back right half of the yoke, with line 1 on the center, I had a 1" spacing between all my quilt lines. On the front left yoke piece, there is one line, one inch from the center front opening that extends from the neck all the way to the bottom (but not on the waist band). This stitch line is also on the right side of the jacket. There are another 4 top stitch lines on the left front yoke, mine happened to be 1.5" apart, I placed the next stitch line, after the front center line, 1.5" away and then spaced them out from there. Save the rest of the top-stitching for when you are done with the waistband and sleeves.
I like to do the waist band last. You need to go back and gather up the gather lines indicated on the vest front and back patterns. These are not approximate. Look at reference photos and adjust as needed to fit the waist band you make. Measure the waist over the waistband of your pants and be sure to have your blouse tucked in when you do this. This might be different from the measurement at your natural waist line. Divide in half and add the 1.25" to that (1 1/4" or 5/8+5/8" for the seam allowance on the ends). You can always just cut the waist band the full length and not place it on a fold but I made mine one that is cut on the fold.
Sew the outer waistband to the lining along the bottom edge and the ends, or three edges. Clip the corners and flip right side out. Iron the folded seams.
Alternatively: sew only the bottom edge of the outer fabric and lining, flip right side out and press the folded seam. Leave the ends open to baste shut later.
Either way you can now attach the waistband and adjust your gathers to fit. I like to machine stitch the waistband to the outside and then baste the inside to the lining. I also baste the front closure edges. All 4 edges of the waistband have top-stitching 1/4" from the edge making a very long narrow rectangle. I then added two hook closures to this. Your belt will go over the top and the waistband will not be seen.