1950s style prom dress for Grease play Olivia Newton John and John Travolta just dressed up in their Grease costumes Grease Sandy Summer Nights Women's Costume Cracker Jack Costumes Brisbane 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 Grease on stage at Players Circle Theater Happenings Magazine Southwest Florida