The Adventure of the Wrong Santa Claus (1914)
I'm a little unclear on some details, but this appears to have been part of a series of adventures built around the character, "Octavius, the Amateur Detective." Based on a title card's invitation to read the story in "The Pictorial Review," I'm assuming it was a series of short stories adapted into film. If "The Adventure of the Wrong Santa Claus" is any indication, these were comedy adventures. The story starts with Octavius being asked to come to a friend's family Christmas party and dress as Santa. He purchases a costume and heads over. While at the party, he's introduced to Grace, who is... some relation to his friends. Or something. He's also informed that there's a spare Santa suit in a spare room, though he decides to wear his own. Unbeknownst to Octavius, a burglar skulking outside overheard that there was a spare Santa suit, broke in, and changed. While Octavius is getting changed, the thief sneaks in and knocks him un...