I found these videos from a vintage Swedish music education tv-show, that seems to have been shown in Sweden and also Finland around 1974. And sometimes there is a young woman wearing a denim vest between all the musicians.
Dedicated to all the beautiful women around the world wearing denim jeans vests while the 1970s this may also be some kind of online museum for the jean vests and denim waistcoats, that were an important part of the fashion in the 70s.
I found these videos from a vintage Swedish music education tv-show, that seems to have been shown in Sweden and also Finland around 1974. And sometimes there is a young woman wearing a denim vest between all the musicians.
A small collection of vintage 1970s denim jeans vests, all found in the WWW. First vest above is a denim vest by Landlubber.
The Jeans Company, that made the cute second denim vest, may be GAMIN:
Third and last vest was made by PENTIMENTO. All three were found in the WWW
In one episode of the Finnish and Swedish TV-show HELA KYRKAN SJUNGER a young woman in a choir singing in the church wore a blue jean vest and a denim skirt.
I found a video taken in a church in Jakobstad 1976 in Finland. A young woman with red hair among the musicians wears a denim skirt and a blue jean vest over a red blouse.
source: https://arenan.yle.fi/1-50187666