Evidently, the Japanese embraced the mini skirt trend with gusto and flair during the 60's and 70's. Take a look at a few records produced by Japanese female musicians from this era to give you an idea...
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I give 100 percent of the credit for this post to Peppermint Kiss Kiss on Flickr who has an excellent collection of vintage Japanese albums. Below each image is a link to the Flickr page as per the Flickr Community Guidelines.