Personalized Sweet 16 Key Long Sleeve T-Shirt. Sweet 16th birthday Long Sleeve T-Shirt - White with a pink car key and retro star bursts. Text says SWEET 16. 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