Lil Frankenstein Costume Kids Boys -- Classic Monster Costume, Size Small 100% Polyester Classic Frankenstein Costume for Kids -- Boys and Girls Alike. This deluxe Halloween Frankenstein costume includes: 1) Jacket and shirt with attached headpiece, and 2) pants with attached shoe covers. The perfect size for kids. Size Small | Chest 27-28 | Waist 25-26 | Height 44-48 This Frankenstein monster costume for boys and girls includes everything you need to make a great costume this Halloween. From Rubie's -- the leader in Halloween costumes.