@desirable_dialogue@ni.hil.ist I will add that there is another option heads have with no serious downside: They can allow a temporary relaxation of uniform rules, allowing students to leave the usual tie and thick black blazer at home. Heads don't like doing this because the uniforms do have a purpose (and there's always one student who tries to see how far they can take it), but it's a standard response when a heat warning is issued.