DC Comics Adult Sized Harley Quinn Costume Includes Top and Pants. Joker-approved Style for Villains (or Heroes) of All Ages! Don Your Costume and Prepare to Take on the World — or at Least Your Next Costume Party. Don your costume and make a joker-worthy entrance. Assemble your squad and rule the night as the ultimate harlequin hero (or villain)! You'll be ready to put a smile (or a frown) on everyone's face and show them that even a clown can be a force to be reckoned with. Strike a pose and make sure all eyes are on you!