Drill (Drillich) is an especially durable material that was used to make the jackets and trousers that the prisoners were supposed to wear in the summer (summer set). The term can also be used to mean a uniform in general. To this day, concentration camp prisoners are associated with the blue-gray striped uniform that gave them the nickname “zebra” at the time. However, not all prisoners wore striped uniforms because there were not enough of them. From November 1942, only prisoners assigned to publicly visible external labor details were supposed to be issued striped prisoner clothing. In the camp itself, the prisoners primarily wore marked civilian clothing that had come from fellow prisoners who had died or – from February 1943 – that had been confiscated from Eastern European prisoners.