Let's have a look at the mini as it marched through the sixties and seventies. In the States it caught on a bit later than the UK with skirts still being about knee length in 1967. The mini finally hit US/Canada catalogs in '68. A couple years into the seventies and the hemline had gotten about as high as it was going to get. Catalogs of 1975 through the mid-1980's featured nary a mini to be found. Longer dresses and slacks were the mini's pitiful replacements (hot pants didn't appear much in mainstream catalogs).
So, let's have a look at a few catalog pages from each year starting with 1968 and ending with its last year of popularity, 1974. Enjoy.
1968
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1969
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1970
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1971
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1972
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1973
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1974