'90s Halloween Costumes: Thelma and Louise From "Thelma and Louise" What to wear for Thelma: Sunglasses, light boot-cut jeans, and a graphic black tank top. What to wear for Louise: Blue jeans, a white tank top, and a cowboy hat with a handkerchief tied around your neck. Get dusty. How to act: You're on the run, so act like convicts, but of the freewheeling feminist variety. Image Source: Everett Collection