There's a picture of Hitomi (ex-Moran) putting on his makeup but idk if that means he always/usually did it himself. Personally, if I were a celebrity, I'd always do it myself. Lol
a lot of bandomen do their own makeup and hair if you watch the off-stage vids... I have no clue about costumes because that seems more or less restricted to VK brands for popular kids and h&m clearance rack for like initial l and shit, and it aint' RPDR, they can't sew????
Well, you can usually judge it by the way it looks. Is it light and crap, usually they do it. If it's a do-minor, they do it, if they can afford staff, they have a make-san that does it for them.