A lot of people on social media are wondering how Storm‘s hair and clothes changed.
People tend to forget that on top of her mutation, she has a magical background. She comes from a long line of sorcerers.
This has been a bit of a thing for X-Men before, mainly in the 90s. When the Gold Team infiltrated the Hellfire Clue during the Hellion slaughter, they were all dressed up in formal ware and then magically zapped into costume when danger arose.
I think explanations like costumes made from "unstable molecules" became a popular reason.