See Olivia Newton John's Best Outfits as Sandy in "Grease" PS Fashion Grease Dresses Etsy 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 Sandy had the best wardrobe hands down, in the movie Grease. Patty Simcox was a close second as the poodle skirt girl. Sandy's pink dress is a vision of beauty! The 50s Grease Prom Dresses Grease: Sandy White Prom Dress Act II Scene I Broadway Costumes