I always thought the meat dress belonged to the BTW era, but I see that all you guys have a point. :-) She recieved all the awards for The Fame Monster in the famous meat dress, and the symbolism goes so well with the concept of the album! "I, am not a piece of meat!"
She wore the meat dress while accepting the awards for the fame monster at the vma's. but it is still more btw era because she introduced it that night.