if you were interested in a girl and you saw her at a costume party would you rather she looked hot in a dress that didn't really go all out with the theme or looking funny in a massive full on costume ie. a full animal suit or something
Depends how shallow the guy is - some may be more interested in the fact that she has a sense of humour and doesn't take herself too seriously. Others are only after the visual side of things and don't care about her personality.