From an essay she wrote in the current issue of GQ Style:

We dress to conform: business suit, dinner jacket. We dress for fun, fantasy, fancy-dress or roleplay. Or we dress simply to be ourselves. And when we want to be authentic, we choose workwear. Workwear has been a vital element in the social revolution of the past 60 years. In 1950 it was invisible; now it is everywhere. It defies the notion that familiarity breeds contempt.