Powerpuff Girls Buttercup Youth Costume Buttercup is the meanest and strongest of the Powerpuff Girls, and your child will be ready to prove it when you get the Powerpuff Girls Buttercup Child Costume. The green dress and pair of glasses make it easy for her to dress up as a classic Cartoon Network character that is ready to fight crime and have fun with her sisters, no matter how long they have to stay up! Add a wig to perfect the look for a big costume party. Item cannot be shipped to P.O. Boxes