At the recent release party for Harry Potter and the Deathly Hallows, there were many people dressed in costumes from the Harry Potter mileu... I, myself, was wearing Ravenclaw robes, along with a tie in house colors. This may be seen as cultural clothing, since it was specific to the geek sub-culture involved in the Harry Potter books.

There were also two young men, probably somewhat drunk, who had put on any clothes they could find which, in their minds, looked stupid. They wandered around, putting on bad, fake English accents, asking if people knew the way back to the shire, where Gandalf was, and so on.

In my book, that's disrespectful. Going to Oktoberfest in a kilt, and participating in the German events, is not.