For myself I offer suggestions of what I would like. I send it my monthly newsletter. Maybe mom felt singled out because you talked to her directly? I personally don't see the issue with pants vs shorts. Those thin pants aren't going to do much good either if they fall and will just be in the way if a scrape happens IMO. I likely wouldn't have been happy with your request either.

I just sent out my newsletter. It says all kids are required to bring hats daily, that I prefer the kind that covers their ears and even better if it ties under their chin. I also mentioned no flip flops allowed, sandals need to be Velcro, to make sure they check their box to switch out weather appropriate clothing that stays here. Also I ask that a sweater gets left here. I have a boy already with a ball cap. I don't like it as I have to worry about his ears getting sunburnt but whatever. It is what it is.