Personalized Engineer Three Shamrocks Youth Long Sleeve T-Shirt. Celebrate the wearing of the green with this three shamrocks and Engineer text design. Unique gift on birthdays, graduations and holidays for the Irish and the Irish at heart. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)