Lily Munster, Girl Model - S1.E33

Fearing that she is not useful around the house, Lily searches for a job. She eventually lands a position as a fashion model, causing Herman to become wildly jealous as he entertains fantasies about the suave men she’s liable to mingle with. With Grandpa’s help, Herman transforms himself into a swinging playboy. Grandpa, in a disguise, poses as his beautiful blonde girlfriend.