Olivia Newton-John's 9 Most Iconic Outfits From "Grease"

Sandy sings "Hopelessly Devoted to You" in her white nightgown at a sleepover with the rest of the Pink Ladies. The floaty sheath dress has delicate embroidery at the collar and bishop sleeves. She accessorized with a satin, mint-colored headband, proving that even Sandy's PJs are well thought out and romantic.