just plain "person on Zoom call" would be good: wear a dress shirt w/ tie and a pair of sweatpants, and keep doing exaggerated nods and smiles with eyes extra wide open.

... sliding chair to the side when getting up, to keep pajama pants off camera.

Uh oh. Is it that obvious?

I generally assume that other people on Zoom are not wearing pants. It would be quite shocking if someone stood up and revealed their dress pants.

I've been in Zoom meetings all morning... wearing Christmas pug pajama pants.

Dress pants would be... odd. Those things are to decorate closets, right?

Closets? Don't you store these at the dry cleaner's until it's time to pick them up for your cousin's wedding?

scarier: hoodie on top, shined shoes on bottom