The Beverly Hillbillies 2x5

Cynthia Fenwick makes her filthy rich mother dress in the "Clampett Look" when they visit the Clampetts, since she thinks Elly is a fashion maven. That only reinforces the Clampett's belief that the Fenwicks are poor. Cynthia mistakes Jethro for royalty and Mrs. Fenwick mistakes Mrs. Drysdale for a cleaning woman.