Personalized Believe In Unicorns T-Shirt. T-Shirt - White with prancing unicorn, retro rainbow, clouds and stars, says I BELIEVE IN UNICORNS. Life is magical. Gift for unicorn lovers. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.