I agree, why go to the bother of dressing a housebound person every day? Just washing face and hands and changing clothes evert 2-3 days should do unless the person is incontinent.
Myself, my older sister, and some of my friends (early 70's) all have pj days - if not going anywhere and it's cold and/or wet, we may not bother to get dressed. Might still do housework, or might not. However I would never go shopping in pj's, although I have seen some young mothers with small children in our local shop in that state (buying fags and milk)!
Some supermarkets have banned people in pyjamas, but I often think a man in a T shirt and jogging bottoms looks more indecent!