Ruling 54
It is not necessary for one to cover his private parts with a particular object, and if, for example, he covers his private parts with his hand, it is sufficient.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)
Purity: Sufficiency of Any Covering for Private Parts
Practical Laws of Islam as per the teachings of Ayatullah Sistani
