Makeup, clothing and masks won't always cut it when putting the finishing touches on a Halloween costume. Sometimes, a costume calls for additional body parts, or prosthetics. For instance, a boy dressing up like a piglet would look a far sight better with a pig nose on his face and a coiled tail attached to his pants. Parents should avoid getting too elaborate with prosthetics for kids' costumes; noses that loop around the head with elastic or slip-on Dr. Spock ears would work well. Remember that children probably won't enjoy having anything glued to their skin, especially when it comes time to remove it.