It's very very rare I don't get out in the day, even if I have nothing to do and no-one to see or am ill, I will try and get out for some fresh air.
As I won't leave the house without showering and washing my hair and everything else, the two kind of go hand in hand.
On the unlikely occasion I didn't leave the house, I'd still have to shower and wash my hair, put deodorant on... else I'd feel grim. Wouldn't bother with makeup though.
Not saying it's right or wrong but that's just how I feel. I woke up later than usual for work once or twice and just had a quick wash or shower without washing my hair but then just felt disgusting all day. It's probably more of a mindset thing.