Look to different sources for the body stocking, I've seen plenty with no seam in the center.
I'd make the collar (necklace) out of heavily stiffened fabric, it even has lines where the seams would be. That isn't the easiest thing to bodge together, it'll take a paper model and a trial run in scrap fabric first but it is possible if you are willing to spend the time on it. i'd design an overlap in the back and have it close with velcro.
the belt and other pieces I'd probably quilt (no, not granny style quilting, simply the technique), mostly just so the exact same fabric could be used on all the gold bits. most gold fabrics you find will be very thin and light weight, quilting them will dramatically change the appearance. Done really well you can fool the viewer into thinking it's a rigid structure.