Here's a public safety announcement (PSA) from the '70s making wearing seatbelts fashionable. 

Begins with a male announcer talking about wearing seatbelts as a new fashion trend. People are seen wearing seatbelts in non-traditional ways, including: as a hat band, waist belt, garter belt, earrings, wristwatch, and suspenders. 

A magician demonstrates the ease of getting out of a seatbelt. A man puts an “I'm belted” bumper sticker on a car and is kissed by a young woman.