On the evils of spandex

Have sewed the whole of the bodysuit for Ghost. (well, apart from hemming the fucker and clipping seams) Except I have problems. It is in two parts, due to the fact that I am human, will need the loo, and the top of it will be stuck in place with bodytape, which wouldn't re-attach.

The best way to stop the leggings part sliding down, as far as I can tell, is to attach the leggings to the top. Except. How the hell does one do this so it'll detatch?

To-do list, costumes

Hocus Pocus
make cape/apron thingy
hem bodice armholes with tape

Ghost
boot covers
holsters and belt
headscarf

Oola
fashion the knickers
head-tentacles - sew up tights, stuff and paint
sew and cut the fishnet outfit