Personalized 2nd Birthday Unicorn T-Shirt. THIS GIRL IS TWO unicorn T-Shirt - Whitebirthday party shirt is perfect for a little girl who loves unicorns! 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.