Ahead of its time': how Olivia Newton John's final Grease outfit became a cultural phenomenon Olivia Newton John The Guardian Copy of Olivia Newton John White Dress Iconic Prom Dress Grease Fashio Hoprom Dress Sneakers for Women MOCALMO 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 One Iconic Look: Olivia Newton John's "You're The One That I Want" Ensemble in Grease (1978) Tom + Lorenzo