Hoodies are banned I believe because it's a loose piece of clothing that another player can possible catch a hand, glove, finger, etc. in as two players are passing. Examples are such as base running past a defender and the ball is hit to that defender, two outfielders in a close call, sliding into a bag or a play at the plate. The loose hoodie can injure the defender by catching a hand, finger or glove and possibly injure the players neck. I don't think they would argue a sweatshirt without the hood. I know in so--er they do not allow hoodies because of potential injury to the wearer and defender. I think it's a pretty good call not to allow them. It's the reason you don't find new hoodies with the strings anymore because the strings were getting caught on things and injuring the person wearing it.
