Finnish actress Sanni Kurkisuo appeared in the 2012 Finnish movie MISS FARKKU SUOMI (Miss Jeans Finland), which is set in the year 1977, also wearing a blue jean vest in a short scene in the movie.
Link to the movie:
https://www.iltalehti.fi/tv-ja-leffat/a/201702212200074411
Another scene showing a club gig of the movies band. I think I've spotted two denim vest girls in the audience, one with a yellow T-Shirt and one with a orange T-Shirt.
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Charlene Tilton, better known from tv-series DALLAS, appeared in the 1979 tv-movie "Diary of a Teenage Hitchhiker", wearing a dark blue denim vest in the scene, were she's threatened by a bad car driver.
Source was only the videotaped tv-movie, not the DVD, so the picture quality isn't hq.
There are more pictures of Charlene wearing sleeveless denim from the DALLAS times...
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... this piece is a red neckholder vest, but it looks like being denim.
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Norwegian singer Wencke Myhre with denim vests on two different magazine covers while the 1970s. Found in the WWW
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Two early denim jean vests from the 1970s: one from 1971 (above) and one from 1973 (below). Found in the WWW
Report from a German teen magazine, including some girls with denim vests. Found in the WWW
