Donnie Darko fancy dress is a great idea for a movie themed fancy dress party. The main, and perhaps only recognisable, outfit you can wear from this movie is the a Frank the Bunny fancy dress costume. It’s actually quite and odd and scary looking costume. It would fit very well in to a halloween or other horror type theme night.
This is a great look if you want to fit in with a general movie themed party but don’t want to go for the more obvious characters. Donnie Darko is more of a cult film so not everyone will recognise the costume but those who do are probably the people you want to be hanging out with.