This is one bizarre story that I can't believe I didn't know a thing about until now. Apparently, trent Harris (Utah filmmaker, Rubin and Ed, et. al.) has even made a documentary (pronounced doc.you.men.TAR'.ry if you are from upstate New York, apparently...) about this. The full story is here, and great photos to accompany it are here.
I have to say, that's kind of a cool dress.