I'm not sure how I came across this dress, but I'm glad I did:
It's hard to see, but those are little clowns. In some kind of Escher castle. Why? I don't know.
If you want to inspire a WTF? from everyone who stands close enough to you to see the clowns, you can find this dress at MissMucho's Etsy shop.
(And yes, I know about this.)