Personalized 3rd Birthday 3 Year Old Girl Unicorn T-Shirt. Cute three year old birthday party design for girls with hearts, balloons and unicorn 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.