In university, students are allowed to bring coats into the classroom and put them on their chairs. In high school, students are told to put coats in lockers. But what if there's a fire during the winter? I know in practice evacuation plans have designated shelters to which students are expected to immediately proceed, but under some weather it wouldn't take long for frostbite to set in. As well, on a more trivial note, putting coats on chairs frees up more space in lockers for other things. What possible reason against coats in the classroom could outweigh both of those things combined?