Frankenstein's Monster Lime Green One Piece (3-6 Months). It's Frankenstein's Monster! This bright green one piece makes for a super-easy Halloween costume, or just a unique outfit!. Comfortable & durable 100 % cotton. Lap shoulders for easy dressing. Machine washable. Great baby shower or holiday gift!. Please note our garments may be labelled with the largest size of the applicable range (i.e. 3-6 months "6", 6-12 months "12", etc.).