Due to the success of the Avengers, Bryan Singer announced no more black leather suits for the X-men. And since Storm in DOFP, what do guess she will be wearing?
There are a few theories:
Storm could wear modernized prisoner costume like the comic counterpart (OBVIOUSLY not in bright green & yellow) She could even keep her hairstyle from the last stand:
Or since the movie takes place in a apocalyptic future, it could be an excuse for the punk look- Maybe give Halle a Rihanna hairstyle mowhawk because I doubt Halle would shave her head to create this look:
This film I am betting Storm dies-- considering she is dead or dies in every version of Days Of Future Past.
(Assuming it's like the comics: Iceman and Rogue would be presumably filling in for Colossus, and Rachel's roles in the story maybe.)