Gigi Hadid Was Sandra Dee For Halloween - and Her Costume Was Absolutely Flawless

Look, Olivia Newton John was a great Sandra Dee in the movie Grease. No one could forget her rocking out in leather pants and an off-the-shoulder shirt at the carnival with Danny. But when Gigi Hadid walked the red carpet at Heidi Klum's annual Halloween party, the movie version of Sandy slipped our minds. Gigi's flawless ensemble was put together by Monica Rose, the Kardashians' go-to stylist, and she pulled it off with ease. Slipping into nylon high-waisted spandex from American Apparel, a cro...