Remus Lupin
Adventurer
Well, I think it's worth wondering what "message" the costume sends. In the case of Harry, suspect there was one set of messages intended, and another set that the costume sends totally independently of the wearer. The costume can send a message, regardless of the wearer that ranges anywhere from "I'm an insensitive clod" to "I really think Hitler was boss" to "I'm playing a Nazi in the movie they're shooting down the way." The wearer can never prevent that message from being sent, even if they're wearing it "ironically." The only exception is if they wear it as express parody, a la "Springtime for Hitler" or Charlie Chaplain's "the Great Dictator."