Also! Didn't Storm have the mohawk and the all black punk inspired costume when she lost her powers in the comics?
So a few days ago I re-read the comics, and yes, Storm made the change right before she lost her powers. So the show is correct, although it doesn't explain why she made that change. Maybe it'll show it in the prequel comic?
This is how Storm describes why she changed her look in the comics:
-Uncanny X-Men #186 (Lifedeath)
Script by Chris Claremont, and art by the legendary Barry Windsor-Smith (check out his art if you haven't already. It's amazing.)