A “Grinch Ugly Sweater” is a festive and humorous piece of clothing inspired by the fictional character “The Grinch” from Dr. Seuss’ classic holiday tale, “How the Grinch Stole Christmas!” These sweaters often feature an image or design of the Grinch and incorporate intentionally tacky and festive holiday patterns, including elements like snowflakes, Christmas trees, or other holiday motifs.