Personalized Irish Ancestors Heritage T-Shirt. Irish Heritage T-Shirt - White green, orange and white colors of Ireland design says I love my Irish Ancestors. Great for a genealogist or anyone with Irish pride. 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.