Personalized Irish Flag St Patrick's Shamrock Toddler Long Sleeve T-Shirt. Irish flag Toddler Long Sleeve Tee - White for St. Patrick's Day has shamrock clover in green. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.