That you don’t like his clothes
When you tease his old t-shirt, he stubbornly holds onto it and says you just don’t understand it. But you’ll probably notice he doesn’t wear it around you again. In fact, you’ll probably notice he went out and bought four more of that one shirt you did say you liked. Deep down, he cares that you like his wardrobe. He knows when he is well dressed, you feel proud to walk around with him.