Personalized First Birthday Unicorn Outfit for Girl Long Sleeve T-Shirt. Cute unicorn with flowers and I'm one quote for baby's first birthday comes on a Long Sleeve T-Shirt - White. 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