Yes, we really wore our hemlines that short. Here are some patterns from 1969 that demonstrate the mini-length hemlines. There is short, and then there is really short:
(Note the bridesmaid's mini dress!)
Then, in 1970, the powers that be in fashion dictated a switch in skirt length from mini to midi. Not happy!! Life magazine, March 13, 1970 edition, captured this fashion hassle over hemlines.
Couture designers were quoted on their views about the hemline change, and they clearly had strong preferences:
In the sewing patterns of 1970 and on, we slowly start to see lower hemlines, including the midi and the maxi lengths. The ultimate compromise was moving the hemline up to just below the knee.