Personalized Nice Until Proven Naughty Toddler Long Sleeve T-Shirt. Nice Until Proven Naughty. Santa Claus is watching, but everybody needs a little breathing room. Funny Christmas gift for everyone, whether they're naughty or nice! 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.