Ok... I was scanning eBay and came across a link
And it even looks like the horizontal layers turn... But I don't get this at all. The big Rubik's cube over the shoulders and covering the torso I get and its what I typically think of as a Rubiks Cube Costume, but this? I have a very hard time seeing anyone actually wanting to wear this. Not that I understand women but I would think most on the sight of this would scream. "Yes, that's just what I need, a big squared off butt!!"
Only plus... looks like the costume is just the cube from the description so I guess you could get 2 and go as a 3x3x6.
P.S. Looking at this some more I'm guessing each layer is a seperate part. It looks like she has the slice layer on top and the top layer she's wearing as the slice layer. Notice in the pic the top layer doesn't have colors on the top of it but the slice layer does. Plus I take it that the Rubik's logo should be on a face center.