aWhaaaaaasa! Bizarre is definitelly the word for this. But lookee here...
Purple was expensive to make, therefore it was associated with the rich and royalty, so to mock Jesus as King of the Jews, they put a purple mantle on him, this led to it being associated with the followers of Jesus, the Bibelforscher/JWs were put in camps because they saw Jesus as their only king not the Fuehrer Hitler not any man and preached the Kingdom so their distinctive patch in the concentrstion camps was purple, easy peasy, no need for what sound like multichromatic LSD inspired explanations.