I saw my boyfriend today and he said "you look very sexy today." But, like I had my hair in a ponytail, not that much makeup and was just wearing a t-shirt and jeans...I don't see how that could possibly be considered sexy at all?
You were looking natural and real, and there's a real cuteness about that. Jeans and t-shirt is a cute look too. A guy can see the real you. Overall, sexy. Recommended. And if he likes what he sees in your natural look, it's a good sign.