Halloween costume idea?

I am a freshman at college and I don’t know what to be for Halloween! I have some ideas but I can’t decide. Plus, there are a lot of really cute costumes but they are so short on me because I have really long legs and my whole butt sticks out!

I was thinking indiana jones girl
A vampire from twilight (but probably not because I can’t find red contacts that I can afford)
Bat girl
The mad hatter
Super girl
Veronica Corningstone from anchorman (but I don’t know what I would wear)

Any other ideas? Do you know of any costumes that are cute but not too short???

Thanks!!