Personalized Pluto Gone Toddler Long Sleeve T-Shirt. Pluto. Gone but not forgotten is a unique gift design for science buffs and astronomers who lived in a time when Pluto was a planet. 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.