[Arwen Evenstar the Fair]

Hey guys, I'm having a Lotr halloween party, and i'm having trouble figuring out a costume. I'm gonna be Arwen, (duh, lol) and can't just go out and by a Arwen dress (cuz those cost a pretty penny that I don't have) so I'm trying to make do with stuff I have around the house, but nothing's right. Anybody got any suggestions??