With this Darth Vader costume, your child can be the chosen one who gets turned by the dark side. Now they will be the father!. Star Wars Child's Darth Vader Costume, Medium. Hard plastic Darth Vader mask with Printed Darth Vader jumpsuit. 100% Polyester. Medium fits 50-54 Inch tall Children with Waist 27-30 Inch, Chest 29-32 Inch and Hips 29-32 Inch.