Event curator at Costume Institute Chair Anna Wintour, for example, showed up in a Spring-themed floral gown from Chanel.To celebrate the new exhibit and the Gala, luxury online retailer Moda Operandi held an auction before the event that allowed women to purchase gowns worn by celebrities such as Gisele Bundchen, Kate Bosworth, Emma Watson, Dakota Fanning, Taylor Swift and Olivia Wilde.Meanwhile,