The simplest way to get the official Darth Vader look is to spring for a premade costume. Another option: Pull together your own mini Vader outfit with a few basics and some accessories. Start with a black shirt, pants, and shoes. Hit the local costume shop for a black cape and Darth Vader-style mask or headpiece. Your last task: Teach your junior Vader to say, "Luke, I am your father," in an eerie voice!