I've been cold for weeks. It starts on the school run, continues all day WFH, then is properly consolidated on the next school run.
In desperation I've tried various things, but the fur lined leggings from Primark are AMAZING. bit of a weird concept admittedly, but bloody hell they are toasty.
I imagine you could wear them under other trousers if you wished.
Honestly, game changing for any other freezers out there.....