You don't have to, quite a few people sleep naked most of the time or once in a while.
sleeping clothes are worn when you go to sleep. without sleeping clothes you will have nothing to wear when you go to sleep. you like to wear pants when you sleep of course not it make you uncomfortable.
For a Quinces party, you must wear formal clothing.
white coat
Stop contamination
You should study for all of your subjects. Appearance doesn't matterjust wear anything that feels comfortable!
you must wear clothes. No nakedness
Proper, modest clothes.
It depends what season of the year is there, but they usually wear long skirts or trousers, a blouse and a jacket. Not very special clothes, but they must be elegant.
Employees must wear Vans shoes and shirt, but bottoms of any are permitted.
a marine bioligist has to wear clothes that are water protective
I suppose that is up to you. But the clothes will likely make sleeping uncomfortable. They will get wrinkled too.
A gunsmith will usually just wear normal clothes. However, they will also avoid wearing loose clothing. They must wear safety equipment.