Personalized Cinco De Mayo Fiesta Sombrero Hat Toddler Long Sleeve T-Shirt. Cinco De Mayo Toddler Long Sleeve Tee - Charcoal has fiesta party sombrero design for celebrating May 5 Mexican Independence Day. 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.