Personalized Engineer White Text Shamrock Toddler Long Sleeve T-Shirt. A white shamrock made from the word Engineer and small shamrocks is a unique gift design for engineers and engineering students on St. Patrick's Day and at Celtic festivals. 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.