Michelle Obama's one-shouldered white silk chiffon gown with organza flowers and Swarovski crystals, designed by Jason Wu, is on display, but there's no mention of her campaign to lessen juvenile obesity. (Photo courtesy Smithsonial National Museum of American History)

Michelle Obama's one-shouldered white silk chiffon gown with organza flowers and Swarovski crystals, designed by Jason Wu, is on display, but there's no mention of her campaign to lessen juvenile obesity. (Photo courtesy Smithsonial National Museum of American History)