Harry Potter Quote design. Harry Potter Happiness Quote is 100% authentic, officially licensed Harry Potter apparel, that comes in t-shirt, v-neck, tank top, longsleeve, pullover hoodie, sweatshirt and zip hoodie styles! Harry Potter is one of the best-selling fantasy book series of all time. From the mind of J.K. Rowling, Harry, Ron, Hermione, Dumbledore, Voldemort, Snape, Hagrid, and all the rest appear in movies, games, and pretty much everything else. 8.5 oz, Classic fit, Twill-taped neck