It's Time For Our Halloween Edition of . . . Costume or Couture?

The street style star: Wouldn't the Vogue editrix make the chicest librarian? We doubt she'd agree, but calling this getup "ladylike" doesn't have the same buzz.

The costume: You'd think it'd be more complicated to copy the most powerful woman in fashion's aesthetic, but it's by far the easiest one yet. Just put on your most dainty floral-print dress, tie a sweater around your shoulders, and top it all off with a bob wig and some oversize sunglasses.