The first lockdown in my country when I was working from home, I made a point of putting on work clothes every day and (more importantly), changing out of them into more casual clothes when I finished for the day. Although to be fair, my work clothes are usually 'smart casual' rather than suits.
The changing out of 'work' clothes sort of fell by the wayside after a few months, but I did always get fully dressed before sitting down to the laptop.
During the colder months though, I'd usually start off with a fleecy dressing gown over my 'day clothes', just until the living room warmed up enough. Luckily there haven't been too many instances of video calls which would require a bit more formality.