Well, I didn't mention the JPOP costumes at all, because... they look good on both Kasumi and Ayane because it's in their style. The WO2 costume does work for Kasumi because that costume is here type of costume, you can picture her wearing something of the sort. (Like you said "as long as that costume looks suitable on that character")
What I'm talking about is someone like Lisa in a nurse costume, does that look suitable on her type of character? She's a scientist. Helena, in a cop outfit? She's posh. Brad is a drunk not a cowboy. And alot of the other costumes are just based off of bad squared circle stages.