Personalized 1st St Patricks Day 2025 Rainbow T-Shirt. celebrate my 1st St Patricks Day 2025 with this sweet boho style green Irish rainbow and shamrock 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.