For women it is for privacy, I mean we all probobally know about skirts flying up in the wind or nosy posy men, so for lady's safety wear underwear.
For men it is because men need to be sanitary, and so they wear underwear to keep other parts of there body clean.
Some people do, but most people wear underwear.
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
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
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.
Yes, yes they do.
yes ofcourse
few
in 1845, people would wear shirts, socks, shoes, underwear, and pants.