BbMost parts of India ladies don't wear either bra or panties. I have served almost in every state of India and met several ladies, noticed their dressing. When sun rises ladies of Jammu and Kashmir usually take off their clothes and take bath outside their house near the hand pump. I never seen them wearing either bra or panty. Several Bihari, odisha and telugu ladies staying around us also takes bath outside their house , when sun dawns . I have observed these ladies when take off their dress, never seen wearing bra or panty. When my son's birthday party was going on my Rajasthani friends along with their ladies attended the party. Due to lack of tables and chair seating arrangenents were made on floor spreading jute mate mattress. When food was about to serve these Rajasthani ladies while on sitting down lifted their lehenga above their knees and settled down and lifted the front part of lehenga to adjust the dress, which accidently show they are pantyless. Kerala and Chennai ladies usually wear a long dress, they call it as "Nighty" or " Maxy" also do not wear anything (petticoat, bra or panties) underneath. This was the scenario of early 20's.
A good percentage new generation ladies of few states now a days wear bra, but avoid their undies to get rid off visible panty line. My wife is running Intimate inner wear shop, she says that her customers buy bra but only few buy panties.
the Romans did not wear underwear but they may wear a bit of leather
No. He wear silk (they say), but that doesn't mean that it's women underwear.
Asian women are allowed to wear underwear in Kumamoto. Many of the Asian women do not own underwear.
No. but if its the only underwear you have then wear it, but its not normal
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.
No. Men and women wear underwear to bed all the time and nothing bad happens to them.
Yes.
Men and women wear underwear so as to preserve or keep their private parts private.
Generally you are nude, but you can wear underwear, especially for women who are menstruating.
Yes
thong for women.
Asian ladies can wear underwear under their dresses. Most Asan ladies do not wear underwear.