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The Man In The Santa Claus Suit (1979)
The mysterious owner of a costume shop rents a Santa Claus suit to three very different men: a math teacher trying to get the nerve to propose, a homeless restaurateur trying to hide from the mob, and a harried political speech writer visiting with his estranged wife and son. Their lives are inexorably changed by their experience of playing Santa Claus.
My husband was in this film.