No shirt?

This morning, I put on a tank top to go under a fleece sweatshirt I was planning to wear. I sat down to check email before putting on the sweatshirt. So I'm sitting at the computer in jeans and a tank top, and Cameron says to me "Why you don't have a shirt on?" (he's obviously still working on his grammar ;)). I told him, "I do have a shirt on" and he came closer and asked the question again. Again, I told him I have one on. And he looks at me, pulls on the tank top a little, and says "No you don't. It's underwear." Oh, how this kid cracks me up!