Philosoraptor quote comment: Judging from what Lady Gaga wears normally it would be quite logical if on Halloween she would dress like a normal person. It's dilemma similar to "what monsters / ghosts / other Halloween creatures wear on Halloween?". If you want to see what normal people Halloween costumes looks like you can see it on Halloween demotivational posters.
Anything related to this Philosoraptor meme:
Lady Gaga costumes are quite legendary as she dress in really strange looking clothes. For example once she was dressed up for a flame. But that's not the most weird Lady Gaga costume. She was wearing once dress looking like made from fresh meat. Just WTF?! o_O