Mine would have to be these trendy baggy trouser bottom type things to wear around the house. They’re not pyjamas bottoms and nor are they tracksuit bottoms. I’m not sure how to describe them other than to say they’re excellent to watch cricket and football in.
I have a pair of those things and I call them lounging pants. Best Christmas present was probably a Celtic selection box from thepiedpiper which had all the hallmarks of being a gift a teacher might receive and pass on.