4. Sharon Tate from Once Upon a Time... in Hollywood
In order to become Margot Robbie’s already iconic interpretation of actress Sharon Tate in Once Upon a Time... in Hollywood, you won’t need much. You’ll have to secure a black long sleeve turtleneck, a white mini skirt, and white gogo boots. In true '70s fashion, keep your make-up minimal and give your hair a slight bump in the back.