Aurah for Muslims is below belly button and knees. Meaning man must cover his area from belly button and below knees.
When we go to Mecca for Haj we are covered by two towels. One cover lower body little above belly button and below knees. The second towel cover upper body with right hand completely cover and towel is wrapped over chest, back and over the left arm. We do all our salat during Haj for three days in Mina in two towels knows as Ahram. If all our salats are accepted in the greatest house of Allahduring Omrah and Haj in Arafat, it is improper to say that salat is not acceptable in half sleeves shirts.
