Hindu actress Zarina Wahab appeared two times wearing a denim waistcoat in 1978, once in a magazine and once in the Indian movie Anpadh.
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I think, the denim vest in the movie is not the same she wears in the magazine. The magazine vest looks like a popular one by Levi's:
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Japanese websites are a larger mystery to me than most of the rest. I think I hae entered some japanese children TV stuff from the 1970s here. Thanks god, anywhere were dates, so it seems, that the tv-show was aired from 1976 to 1977 in Japan. Don't ask me, what it is about, but Secret Investigator Lisa Akechi, the young woman with the light blue denim vest was played by Japanese actress Miki Hayachi.
If you want to go deeper into it, here are two links to the sources:
http://blog.livedoor.jp/shimma/?p=149
http://taikino1.blog.fc2.com/blog-entry-248.html
The whole Swedish Dancing Band WIZEX was clothed in denim on denim on the cover of their 1974 Long Play Vinyl Album. The only woman in the band, singer Kikki Danielsson wore blue jeans and a denim vest too.
In a short documentation movie about Iceland from the year 1976 I have spotted two woman in dark denim and vests. Not sure, if these are really denim vests or maybe some other kind of material.
