The costumes would have evolved post X-3 and could have featured more colors. Its a shame after X3, Fox just decided to focus on spin offs when the final team of X3 could have evolved more and gotten new members to accompany them. It would have been interesting to see if the likes of Gambit, Psylocke and Polaris had joined the team post X3 and if their signature costume from the comics would have a gotten a black leather costume. With Emma, I imagined her wearing a white version with a very revealing top.