In 'Pulp Fiction', Jules is a character. Maybe a tee shirt could be related in that there could be a tee shirt with Jules' image on it, or perhaps Jules was wearing a particular tee shirt in the movie that became iconic in some way.
I don't know the main characters as I've not come across this story. But if Tee is in the title, Tee might be one of the main characters, and of course, the snakes are likely to be important characters as well.