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there must be other similar stuff available
https://www.dewalt.co.uk/product/dcj060xxl-xj/18v-xr-heated-outer-shell-jacket
Other jackets available for different battery systems!
You need an infrared heater or something like that, heat the person not the space. I had one in the cellar in my old place because it was never going to be worth heating but I used to spend quite a bit of time tinkering in there.
This is what I had - £50 on eBay:
https://www.sealey.co.uk/product/5637190515/1500w-infrared-quartz-heater---wall-mounting-230v