This has been on my mind for a few days with the rising heating costs and so I'm posting here for traffic, as maybe it can be useful for others.
I have my heating very low during the day and I'm often at home sitting - and get cold easily. Decathlon have cheap ski base layers. I use them to keep warm and they're great. I only use the tops but I have the leggings too and rarely have used them when there's not snow outside. So I'm not recommending those as a first step, unless your legs are always cold. They are really warm though! I often wear the base layer top under a jumper or sweatshirt, jeans and warm socks and it makes a really big difference.
The adults costs £6 and kids ones are £4. They're also quite thin so dry quickly.
There are also merino ones and other brands that make higher quality ones, but for the purpose of staying warm at home, rather than concerns about staying warm and dry on a cold piste, these do fine.
www.decathlon.co.uk/p/women-s-base-layer-ski-top-100/_/R-p-302806?mc=8510031&c=GREY
Anybody else have good tips?