I cannot fathom for the life of me why it would be dangerous, or even just a bad idea, to allow kids to figure out for themselves how best to regulate their own body temperature.
I mean, we all vary in how we feel the cold or heat, don't we.
Discomfort is likely to increase distraction, rather than foster focus. How could that possibly be to the pupils' or school's advantage?
Why do schools do this kind of crap?