The French designer was synonymous with striped sweaters and Left Bank insouciance.
The music star had launched the collection last February during New York Fashion Week.
Hats are making a comeback just in time for summer in the capital.
Sydney Finkelstein, professor of strategy and leadership at the Tuck School of Business at Dartmouth College, weighs in on J.C. Penney and Ron Johnson.
Hollywood and Washington came together at the annual event.