The magic behind quick change?

Question:

The magic behind quick change?

http://www.youtube.com/watch?v=rb-wugnyg...

I've seen this live before. I can't quite figure it out. How does it work?

Also, if anyone knows what that song is, it'd be greatly appreciated.

Best Answer - Chosen by Asker: Hey Victor,

That is just amazing! I have no clue - at first, I thought one dress is removed showing another, but OMG - Thanks, I enjoyed it. Sorry I don't know. I found a few sites for you to uncover the secrets though.