I randomly read an article about the costume design for Wicked once and she said she never has Elphaba in black, it's all very dark shades of dark colors (purples, blues, reds, etc). You can tell what she's talking about if you look at a HQ picture of Elphaba in her act two dress (the one she wears during No Good Deed, I think?).
But at least from what I can tell in that picture of Drew as Armand, it LOOKS like she did the same thing. Or at least didn't put him in entirely black. I see purples and reds in that costume.
Ahahahahaha, the mental image of Drew as Elphaba is hilarious.

I'd love to hear him belt out some Defying Gravity.