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Plaid pants, bell-bottoms, and hippie headbands provide a flashback to a 70s Christmas with Robert Earl Keen. Photo by Don Mathis.

Plaid pants, bell-bottoms, and hippie headbands provide a flashback to a 70s Christmas with Robert Earl Keen. Photo by Don Mathis.

Plaid pants, bell-bottoms, and hippie headbands provide a flashback to a 70s Christmas with Robert Earl Keen. Photo by Don Mathis.