Well, this girl from Germany appeared in a magazine for male readers. She also starred with the same outfit, wearing a jeans hat, blue jeans and a jeans vest, in a vintage 8mm German loop from the late 70s wearing the same outfit too. Found in the VEF
Young woman in blue jeans, white blouse and denim vest on a party with lots of people wearing denim on denim. Found in the WWW
American actress Didi Conn wears a denim vest in the American movie YOU LIGHT UP MY LIFE from 1977. I found the full video anywhere in the WWW, but wasn't able to find it again to link it here. The denim vest sequence is short, only about 2-3 min
A girl named Chrissie wears a blue jean vest with rainbow stitching at her first date in this Dentyne Gum Commercial spot from 1978. Brand of the vintage vest: Faded Glory
It's not easy to compare with actual photos because of the low resolution video clip, but here are some present photos of a woman wearing the same kind of denim vest:
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