Personalized 1st Birthday Outfit One Gold T-Shirt. 1st Birthday T-Shirt - White outfit for your 1 year old baby has gold stars and lettering that says one, perfect for a first birthday photo. 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.