They have the world's best designers at their beck and call, and should know how to work amazing clothing -- after all, they do it for a living. So when The Costume Institute Gala comes around, which is essentially the Academy Awards of fashion, models should naturally, be on top of the Best Dressed list, right? Nope. There was so much dress fail at the 2011 event, but the worst had to be Raquel Zimmerman (left) and Elletra Rosselini Wiedemann (right). Raquel went for a look that screamed “sexy yeti made a baby with Lord Voldemort," and Elletra chose to channel the ghost of bad prom dresses past.