"I'm naked. But when I do get to wear clothes, I love the '70s outfits."
The actress also said she wears a body suit in some scenes, instead of being covered head-to-toe in body paint, and that Mystique's demeanor has also changed in director Bryan Singer's sequel.
"Some of the Mystique look is a little different, but we're still using the same paint. But she's different in this film too. She was struggling - like a lot of normal humans - with the way she looked, and she was covered up a lot in the first movie, but this time she is Mutant and proud."
Production wrapped on X-Men: Days of Future Past in mid-August.
X-Men: Days of Future Past was released May 23rd, 2014 and stars Hugh Jackman, James McAvoy, Michael Fassbender, Jennifer Lawrence, Halle Berry, Nicholas Hoult, Anna Paquin, Ellen Page. The film is directed by Bryan Singer.