Layers of the "armor": It looks to me like the brown suede/leather "armor" part of the costume, on over the unitard, is made from multiple layered pieces. I've highlighted and colored above what I think the different layers and pieces are.

Main pieces going full length, ordered inner to outer layers: black, brown, grey

Chest pieces, inner to outer: black, brown, purple, red, dark blue, light blue, lavender, white

collar, inner to outer: gold, pink. The pink has a slit down the center that is closed by two black ties.

shoulders inner to outer: green, pink. I think the green looks like a more cloth-type layer, probably sewn onto the unitard. In some reference pictures, the main black piece appears to go over the green piece on the shoulder, in others it seems to either end at the edge of the green or go under it.

waist inner to outer: dark pink, light pink, belt over both.

The different pieces appear to be edged with something that looks like piping. Or it could be the seam at the edge... the edge of the material turned under for a hem and then the seam sewn slightly in from the edge, to create the effect of a piping trim? I'm not sure yet which method I'll use... depends on which I can get to work, I guess.

I'm going to use suede rather than leather or vinyl. Leather is too expensive, and vinyl just won't have the right flow and ease of movement. Plus the suede should be easier to work with than either.

I'm not sure whether the different pieces are different colors of brown or not. In many pictures they appear different shade, but that could be either the different angle of light, or artist interpretation to better differentiate the layers.