'90s Halloween Costumes: Kimmy Gibbler From "Full House" What to wear: An oversize sweatshirt (double points if it's neon) and leggings. Wear your hair in a half-up, half-down side ponytail with a scrunchie. How to act: Like you own the place; seriously, barge in to every room uninvited, and don't leave until you get kicked out. Image Source: Getty / ABC Photo Archives