German actress Marina Kuschel appeared in the 1977 German movie DIE JULIA VON NEBENAN, wearing a blue jean vest. The cute young woman in only denim on denim desperately tries to become the girlfriend of an older boy living next door.
Watch the movie here: https://www.veoh.com/watch/v77403950HDFDmzqg
There are some more young women with vests and denim vests in the film, they can be find in the classroom scenes of the main actress. ´
And also men appear with denim vests. For example this one here entering a train from a train station platform: