Olivia Newton John( Sandy in Grease) Smiffys Grease Sandy Costume in Yellow for Adults, Skirt, Shirt, Mock Cardigan, Belt, and Headband, Officially Licensed, Ideal for Matching Fancy Dress with Cardigan and Belt Details BigaMart Dress The Part: Olivia Newton John as Sandy From Grease Over The Moon Grease Sandy Costume, Yellow This sweet yellow party dress was first seen in the 1978 , where actress Didi Conn wore it as Frenchie. After that, the dress very likely went into rental stock, where it