As for getting your girlfriend to wear a princess Leia costume that would be really hot, but I think I'd be a little too insecure to mix Star Wars with my love life that much. Do I really love her or do I love princess Leia?
I don't know. A few years ago, I got her to act out the Han/Leia kiss scene with me, something I'd wanted to for years as well. Is that a little bit weird?
And don't forget That '70s Show where Eric had Donna dress up as Leia, complete with the buns.
"Use the Force, Eric..."