I was much warmer in my teenage years. I remember walking to school in the 6th form, having had a brisk 2 mile uphill walk under the weight of hefty A-level textbooks and folders and stripping to my t-shirt on a cold, sharp, frosty morning. The teacher on duty passed comment about my lack of clothes but there was literally steam coming off my sweaty arms. After about 5-10 mins indoors I had to layer back up.
I like layers as my body temperature changes a lot between moving/ being sedentary.
For work, it was often cold in the mornings but warmed up through the day. I'd wear vest, shirt, v-neck jumper, and a long cardigan, knee length socks and trousers. It gave flexibility as the temperature changed.
I've been verbally abused in the street because my sensory child was wearing shorts in 1⁰C... the thick bare-headed skinhead didn't register the thick coat, gloves and hat. DS was perfectly happy- I'd certainly know about it if he wasn't! On thermal imaging cameras, he shows up blazing white, compared to me and his brother so he is genuinely hotter than us despite less clothing. On the other hand, in hot weather he still wears his thick fluffy jumper (there is one specific tolerated type) to protect him from the heat, and he prefers the predictable feel of his own body heat to variable external heat.
His school uniform is shirt and blazer. No option for jumpers. He will wear a waterproof/ light coat in extreme weather, but the lack of clothing tolerated in school doesn't seem to bother him. He has to walk 10 mins from where he's dropped off/ picked up or catch the bus and walk a mile.
I don't care what people choose wear as long as they don't repeatedly whinge about it.