I don't know about in your part of the world, but in London at the moment, the only rules style wise seem to be that there are no rules. Absolutely anything goes. (OKay: one rule: no denim shorts over black leggings with ballet shoes: that screams spring 2009, 2010 at a push).
Saw these girls while out with Mr. Dot, at the V&A. JK (left) works with a great group called White Kat. Yashka.. still can't quite work it out. But when I find out, I'll let you know. All I know is, these girls are a delight. And they can jump.