So whatever the reason, his heart or his shoes, he stood outside his cave, hating the Whos. Steal Christmas as the Grinch this holiday season with the officially licensed Dr. Seuss Santa Grinch Costume! You'll be instantly recognized in the red Santa shirt, hat, and EVA mask featuring the iconic characters signature Grinchy smile and yellow eyes. The ends of the polyester shirt are printed with white detailing just like Santa's suit.