Re: theatrical attire onstage
I think you are on the right track by considering your band's appearance on stage. The way I see it, when you are performing live, you are putting on a show that is both aural and visual. If you don't exploit the visual side of things, you are really missing an opportunity to make a bigger impact and a better show.
As for your idea, I don't like it so much. Being clownish about ethnicity may be a turnoff for some people. Even if being clownish is not your intent, it may well be perceived that way. People can already see your band is ethnically diverse. Wouldn't it be better to treat it like it's really no big deal?