What does the purple cloth on the cross mean?

Every year around Good Friday and Easter I notice purple cloth draped on crosses outside of churches. What is the significance of the cloth and also the purple. I know that around Easter churches sometime perform passion plays. Does the purple denote "passion" or something else? Only genuine,... show more Every year around Good Friday and Easter I notice purple cloth draped on crosses outside of churches. What is the significance of the cloth and also the purple. I know that around Easter churches sometime perform passion plays. Does the purple denote "passion" or something else? Only genuine, knowledgeable replies, Please.
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