The Double Husband(1955)

Original title: Der doppelte Ehemann

Grethe Koblanck and her husband own a successful fur fashion house in Munich. She suspects him of flirting with younger women, including the South American Dolores. She employs a hidden camera to keep an eye on him. Upon discovering this, he gets a doppelganger to take his place. Things go wrong when it turns out his double also has an interest in attractive women.