Vodka, is that you as schoolgirl ? Gorgeous, sure to turn heads! As for shopping: some sexy outfits can be found - believe it or not - in Walmart! They do sell online, and at half the price...
ABC is always fun last year she was wearing "Wet Paint" caution tape. It would be fun to get some Daytime themes but participation is everything. Even the best ideas suck if no one else joins in. Glow nights are fun but it's usually those of us that bring an absorb amount of glow sticks that get lots of people participating.
When I think of zombies I think of clothes half ripped off. I don't know how much participation these farther stretched ideas would get though.