Do indian men wear underwear

Answer 1

It is not clear if you are asking about men in the Indian sub-continent or native American men (and if so, which particular cultural group) - or even if you mean today or in the past.

If your question was meant to ask "Did native American men in North America wear underwear?", the answer is no.

Some native people went entirely naked, such as the Coast Chumash of the area that became Southern California. In some groups at an early date, the individual leggings were made to overlap at the tops, covering the groin; among other groups simple separate flaps of tanned hide were worn hanging front and back. Powhatan men and their neighbours wore just an apron of deer skin at the front and nothing behind except the deer tail.

But the breechclout worn by most North American tribes throughout the 19th century was a long, narrow strip of soft hide (later trade cloth) that passed between the legs and was drawn up and over a narrow belt so flaps hung front and back - even if the wind caught it, the wearer was still completely covered. This was not underwear, but was considered to be the only essential garment for men - leggings, moccasins and shirts were optional extras.

In the historic period, natives did not wear trousers (pants) and if they got a pair they would cut off the legs to use as separate leggings and throw away the rest.

See links below for images: