What do you call it, and do you wear one?
I used to call it a dressing gown, but slowly changed over the years to call it a housecoat. I'm in Canada, so maybe it's regional.
I have a short, thin summer one, but do not own a warm one for winter. i have a old adidas track jacket that I put on over my pyjamas. It makes it easier to do dishes/chores before getting dressed.