Personalized Unicorn 1st Birthday Long Sleeve T-Shirt. This little unicorn is celebrating her 1st birthday. Happy b-day little one. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL