Personalized Mechanical Engineer Flowers Toddler Long Sleeve T-Shirt. It's flowering time in mechanical engineering land with posies made of gears, screws and tubing. A humorous design for gifts at birthdays, holidays and graduation. 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.