I saw the Tor post on Stormlight fashion and had to post my process for the Shallan Devar cosplay I did.
The first photo is a muslin mockup. You can see where I altered the princess seams to add a facing on the left breast to allow the dress to open there and have functional buttons.
I used 100% dupioni silk, hand stitched the whole thing over the course of two weeks with 100% silk thread, and used shell buttons (to get as accurate as possible) that decreased in size toward the waistline.
The last photo is the one Brandon took of me at the signing. I look all goofy because I was so excited, but when an author likes your cosplay enough to snap a pic, that’s the one you use.