Personalized Lucky Puppy 1st Birthday T-Shirt. 1st St. Patrick's Day or 1st birthday T-Shirt - Light Blue with cute leprechaun puppy sitting on a lucky horseshoe, shamrocks and argyle pattern number one. Perfect for a wee Irish lad or lass. 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.