Seriously, this song title is a mouthful.
Sure, the video may run counter to the ideas that most people have for Halloween costumes...but who cares? I'm not saying that I'm against scantily clad ladies on Halloween, but you can only have so many variations on the same thing.
Though to be honest, this post exists solely so you may see women dressed as Unsexy Louis C.K. and Unsexy Bill Cosby.
If you still need ideas, I recommend colorful balaclavas and/or dressing as a vagina.