As perfectly as the miniskirt and the boot went together, it was a fleeting fashion that only lasted a few years - roughly, from the late sixties until '71. Granted, girls still wore them on occasion, but it was largely a trend of the 'shagadelic' era.
I am happy to report that college campuses in the US are currently flooded with minis & cowboy boots (and, oddly enough, winter boots). Without question, nothing will compare to the iconic go-go boot, but beggars can't be choosers.
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