Your daughter will be the best evil sidekick in town this year when you dress her up in the Harley Quinn Girls Costume With this set, your daughter will receive just the outfit she needs to become the Joker's main partner in crime. Featuring a red, black, and white checkerboard jumpsuit, a matching red and black jester hat with white pom poms, and a black eye mask, you can't go wrong with this stylish Harley Quinn costume.