Halloween costume with black crop top?

I have a crop top similar to this one

http://www.charlotterusse.com/product/Caged-PU-Fro...

Mine though is a little more open in the back, a little longer, and has mesh sides. I bought it for a good price and thought it'd be easy to come up with a creative halloween outfit for it, but it's become harder then I thought it would be. I'm trying to not just end up being a black cat or something like that and am trying to be more creative with it.