I try to imagine Game of Thrones as if it were a high school drama instead. Cersei would be the popular senior cheerleader. Jon Snow would be the cool outcast kid who skateboards, but doesn't smoke or drink. Tyrion would be the local drug dealer. And Arya would be a school shooter. I'm just saying, the girl is cold blooded. Somebody get her on some zanies.
This guy's shirt is awesome because it gives a glimpse of how the Game of Thrones families costuming might be portrayed as high school football teams. Show your school spirit without the risk of an arrow firing into your neck. Since no one represents the wolf pack more than Arya, this was the perfect thing to wear when meeting her. Who knows, if he wore a Lannister jersey we may have never heard from him again.