Non Princess Leia Star Wars female costume?

On Friday my school is showing Episode V and I was planning to be Princess Leia in her Hoth outfit, but today my boyfriend told me that he couldn't be Han Solo because one of his friends is going as him. (I don't really see a problem because I'm sure everyone and her mother is going to be Leia, but ANYways) He narrowed it down to C-3PO or Luke. My problem is if he's Luke I don't want to be Leia because that's his sister, and I don't see very many other options for a girl. Any ideas?

ONLY FROM THE ORIGINAL THREE MOVIES PLEASE! I don't care if she's a ridiculously minor character or an extra, but please no characters that only exist in the animations, comics and books because I haven't read/watched any of those. Also no prequel/special edition characters please.