Veteran of working from home for too many years.
Good old Fruit of the Loom thermal vests & leggings are good, fingerless gloves and this year, since there are now 3 of us working from home...Oodies.
Giant enough to wear over anything & pull off to Skype/Zoom etc if needed.
Also, I love my Woolsies slippers, real wool and gorgeously warm.
Being menopausal & well into The Great Husking I end up chucking most things on & off a billion times a day (which, I’ll be honest, has saved on heating bills for the past few years). And we have two giant fluffy hounds who loaf under our desks.
Move around at least once an hour, even if just to make a brew or let the dogs out. Chilly thermal mug filled with tea as well.
We’re lucky, with 2 of us in our small home office & lots of desktops/laptops servers heating the room. I don’t think we’ve ever claimed anything back on our accounts for heating allowances, not since the first year.
TL;DR layers, computers, moving around, hot drinks, thermals, slippers, Oodies, menopause. And two giant hounds.