Mariah dressed as a mermaid for Halloween. It also looks like she drew her abs back on with makeup again. I think she's figured out she has to use less paint to make it look real.
In a couple of these it looks like she's forming an all girl version of the Village People. There's the Indian, and the Lara Croft. I don't see the policeman or the Leather Queen.
From Drunken Stepfather (NSFW).