Wasp in Ant-Man and the Wasp
Wasp’s costume in the movie was much less bright and colorful than the original character that was drawn by Jack Kirby. The designers said that functionality was more important than creating a costume that would please the comic book enthusiasts. This costume was suited best for the actress because she could breathe well in it.
Loki in Thor
Loki garnered a devout following after the release of the first film, but his costume choices received some harsh words. In fact, it seemed like the pants were a bit little snug in between his legs. The designers fixed it for the following movies.