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.

The movie The Man in the Santa Claus Suit, released in 1979, features 1 song from Fred Astaire.