Well... after three years and a crap-load of trial and error (about 20 different patterns and three different types of material for the red swimsuit section, and 5 different patterns and 3 different materials for the collar), I finally finished this pain-in-the-ass project.
After sewing the bottom part of the swimsuit together in the back, I slipped it on the figure and then had to sew the parts that cover the breasts onto the ring while it was on the figure. The collar had to be done essentially the same way to make sure the tension was correct. The pattern is still slightly off, but I've had enough... so it'll have to do.
Head Sculpt -- Wondery Leona (rerooted by Kristen of tsubasahome.com)
Body -- Phicen seamless Pale Large Bust Version 4 (plastic skeleton... the only ones that would work with the boots that I wanted)
Red swimsuit -- ultra-thin PVC; Collar -- faux leather, from MJ Trends
Boots -- unknown, from eBay
bracelets & collar ring -- gold jewelry-making accessories from Michael's
Bat -- unknown, from etsy.com
Base -- Triad "Grave Danger"
Thanks for looking: