Personalized Let Shiitake Go Toddler Long Sleeve T-Shirt. Toddler Long Sleeve Tee - Black with a funny meditating yoga mushroom says LET THAT SHIITAKE GO. Bad food pun, funny food pun, yoga lovers gift. 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.