Halloween Costume

I am trying to come up with something cheap and easy for Halloween this year. I have a small stash of costumes at home, but most of them have been worn in the last few years. I have:

Dorothy
Wonder Woman
Black Catsuit
Long Black Wig
White Lab Coat
Military Uniform (green wool)

I was thinking that a corpse bride type thing would be cool if I can find an old wedding dress at a thrift store (I'm probably too late for that). I was also thinking of doing something with the lab coat; mad scientist, butcher, etc.

Any good ideas out there?