Thanks for the notes, all. Good to hear from you!
@anthropon, I got the rainbow stripes onto her costume, I don't think I need to get in suspenders as well. And really the vibe here is supposed to be 70's Disco, not just all 70's across the board. (But I'll definitely take it if it's looking Brady Bunch to you! I still haven't managed to get a disco floor in though.
@alykam, thanks for the note. For the pants, I did it the exact way you mentioned. The key is to have really smooth transitions in your greyscale, so I paint it entirely with a soft airbrush. Also, be sure to paint it like it's lit from above, white on top. Here's what my greyscale and gradient map look like:
Hope that helps!