Too right I would. Played at Saturday lunchtime, legged it to work and put a late afternoon shift in many a time when i had to go in on Saturdays.
50k dead, thousands with covid, millions on furlough, hundreds of thousands paniking about their jobs/businesses and you're worried about little Banta because she's a bit sweaty in maths? If you're warm, sit in your kit, if cold then put your pants on over the top. In all my years at school I never, ever met another pupil who was bothered about being sweaty after lunchtime football - which we played in our uniform, not even PE kit.
<Sigh> Not this crap argument again. Remind me where the largest proportion of cases come from again? (Hint, places where victims where tipped into by the government)
Kids usually run round in uniform on breaks. PE lessons tend to be no more intensive than that. They're not doing hour-long HIIT sessions.
I'd expect the dislike is more about things being uncomfortably different. I'm sat here now in what is basically the same as school PE kit bar what's printed on it. It's what I wear every day pretty much.
A lot of kids don't just peg it around at lunch, but that is not the point.