Personalized 13 Year Anniversary T-Shirt. 13th Anniversary T-Shirt - Purple has Happily Married 13 years and counting anniversary celebration quote, a great way to say Happy Anniversary to the happy couple. Everyone loves our Custom T-Shirts! 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.