User blog comment:IamJakuhoRaikoben/Chapter 366: 1000 Souls, Review./@comment-7418318-20140109161904/@comment-76.161.172.226-20140109170632

Generally speaking, people engaging in deliberate torture strip their victims to underwear at best, but naked is quite common too. It's an additional humiliation and vulnerability for the victim, and torturers generally don't want clothing getting in the way.