American Horror Story is full of Halloween inspiration, and though it's all about Roanoke now, Freak Show has so many great costume ideas. Who wouldn't love to run into Bette and Dot Tattler at a costume party? If you haven't already settled on another pop culture costume, take a look to get some inspiration from Elsa Mars, Desiree Dupree, and, of course, Twisty the murderous clown.