Just Kidding! It is a commonly known fact that the victims entered the showers naked.
The showers were for showering, so naked would be the right way to enter them. Delousing of clothing was done in completely different facilities (with high tech, sealed, doors marked with skulls and crossbones and danger warnings). There were no fake shower rooms. They all had functioning shower heads, with running hot and cold water, absent any mechanism for introducing any sort of gas. Many inmates included in their memoirs how they appreciated the opportunity to shower on a daily basis in them, and how they'd get up early in order to avoid the crowds that gathered there for showers.
