Some people do, but most people wear underwear.
Yes, most people do in jail just as outside.
The wearing of underwear under pjs is a matter of personal preference. They wear whatever is comfortable for them. Then too, it depends on why they are wearing pajamas. Most people here in the west use pjs mainly for sleeping and may or may not wear underwear with them. However there are some cultures that wear pjs as lounging attire at home and these people more than likely would wear underwear beneath the pajama.
Some women wear underwear under tights and some do not. Tights are made to be worn without underwear, but many people do still wear them.
yes
Most of the overall population has the idea that they HAVE to wear underwear to be normal, but in reality underwear is only a recent invention, and because most people shower regularly there is no real need for it in these modern times. Most men "go commando" from time to time; some men never wear underwear. It is mostly a matter of comfort and support. I prefer freeballing because I enjoy the freedom associated with it.
The answer depends on what you consider to be underwear and in which country. In tropical countries people are more likely to wear light underwear whereas during the winter people in cold countries are more likely to wear heavier underwear.
people where to wear pants so they do not eat cake
Asian ladies can wear underwear under their dresses. Most Asan ladies do not wear underwear.
Some people are more comfortable not wearing underwear.
No, Infact some people wear compression shorts as underwear
People wear underwear. People wear an undershirt and underpants.