Elsa Martinelli

 

Italian actress Elsa Martinelli with denim vest and blue jeans in the 1970s. Found in the WWW

And another picture of her with the same outfit, taken by Umberto Pizzi and showing her together with Willy Rizzo and Robertino Rossellini.

Neuf façons neuves de vivre en jean

 

This picture is part of an early collection of denim and jeans clothes displayed in the French Elle magazine in 1971. 

https://www.featherstonevintage.com/blogs/archives/neuf-facons-neuves-de-vivre-jean

Ursula Mayen

The piece worn by German singer Ursula Mayen on the cover of her 1974 vinyl single looks like a denim vest to me. Found in the WWW 

Blonde wears denim on denim

 

A blonde woman wears denim on denim look, a light blue jeans and a vintage indigo blue denim vest. Found in the WWW

Boy of the week - S

 

Farkkuliivi

 

A Finnish woman with denim vest and jeans skirt. From a 1970s catalogue. Found in the WWW

Paradise

 

French music group PARADISE on the cover of their 1977 Long Play Vinyl Album and Single. One female member wears a blue jean vest and denim on denim. Found in the WWW.