I also asked at the Sew Obsessed group on Ravelry, and mamafitz there came up with this pattern:
http://www.butterick.com/item/B4918.htm?tab=evening_prom_bridal&page=2
It's fabulous! I'll just have to pleat the bodice instead of doing the twisty thing, and add decorative pleated side-straps.
The order of operations you suggested sounds good. Thank you so, so much!






















