it's a mesh skirt, but it moves. You script it so different "faces" show in a sequence and it looks like it's moving. I've seen it done oor other things, but using it on clothing is a neat idea.
it's a bit like having mesh and having flexy too, except that the motion isn't as fluid, and like I said, this one is kind of fast. Which I guess would be right if you were skating with it on. Looks like you