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It was created by costume designer William Travilla and worn in the movie's best-known scene

For the event, the new mom teamed up with her go-to stylist Andrew Mukamal, who was responsible for her Barbie press tour looks (and recently, Lindsay Lohans Freakier Friday promo outfits)

The luxurious fabric drapes beautifully while maintaining its shape throughout the day

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The Rhode founder was photographed arriving at Kylie Jenner's party wearing a little black dress with a fitted bodice, a drop-waist belt, thin spaghetti straps, and a thigh-high leg split