Neville didn't usually sleep in a shirt. He had for most of his adolescence, but at some point during the war, when Neville started living in the room of requirement out of a gym bag, he had stopped wasting clean shirts on sleeping. He only wore a shirt because he was at Hannah's. He wasn't at a point where he felt comfortable about wandering around shirtless in her house.
Now as he hand slid further up his shirt, however, Neville felt silly for wearing it. He pulled back for a moment and tugged the t-shirt off over his head. It was too warm with the heat and the blankets and her body to be wearing it anyway.