Kate Mara and Zac Posen are my picks for the winners of the best dressed in the superhero theme for the Met's Costume Institute Gala. Kate Mara in a yellow fantasy Zac Posen dress and the designer himself in a bright blue suit, they just look fabulous together for this dramatic theme. Now what superheros they would be, I really don't know. Maybe super designer man and feroshacoutura sidekick.