Make a custom dressform, display mannequin, body double, cast, or a big pinata with some help and a little paper gum tape. You could also use this technique to make paper casts of other body parts, objects, or people!
I got the basic directions and idea from here: http://www.taunton.com/threads/pages/t00002.asp
But since they didn't really go into that much detail, I've made an Instructable (my first! yippee!) since I was originally looking for one here anyway.
Making the dress form is pretty easy, and only took us about 2 hours to complete.