Striped prison jacket with an inverted purple triangle badge worn by Matthaeus Pibal, a Jehovah's Witness, during his imprisonment at the Dachau concentration camp. The purple triangle badge was used to identify the prisoner as a Jehovah's Witness. Matthaeus Pibal was arrested as a Jehovah's Witness by the Gestapo in 1940 and sent to Dachau. He remained in the concentration camp until the liberation in 1945.
Source: U.S. Holocaust Memorial Museum