Personalized Black Sombrero Cinco De Mayo Youth Long Sleeve T-Shirt. Cinco De Mayo Fiesta Sombrero Youth Long Sleeve T-Shirt - White makes a great custom holiday gift. Celebrate May 7th in style. Viva la fiesta. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)