From the Dr. Seuss Costume Collection. Dr. Seuss The Grinch Adult Costume. This costume includes a polyester Santa Claus jacket with fur trim, a vinyl Santa Claus belt with metal grommets, and a deluxe Grinch mask with attached hair and furry Santa Claus hat. Gloves and pants not included. This is an officially licensed How The Grinch Stole Christmas™ costume.