“This is the year of the changing hemline,” says this Butterick Fashion News flyer from July, 1970.
“There is no longer one length for one woman, but a whole wardrobe of lengths from which to choose. Mini, regular, midi and maxi length. . . Butterick has the right looks in the right lengths.”
Pattern number 5785, on the front cover, is even longer than ankle length.
“Butterick 5785: From head to toe, a full length cover-up; super to sew in see through crochet fabric. Misses 8 to 16, 75 cents.
Other lengths were defined in this chart:
However, an even shorter length, the Micro Mini, appeared in the same flyer:
This dress was so short that the pattern included matching bikini briefs. No wonder the girl on the lower right looks shocked.
“Butterick 5821: The micro mini, with self belt, raglan sleeves and matching bikini briefs. Easy. Misses 8 to 16.”
For comparison, here is a mini length wrap dress, which can also be worn as a tunic over pants (both views are shown):
“Butterick 5759: A mini length wrap dress with elasticized waistline, long kimono sleeves, and a narrow self-tie belt can double as a tunic over matching pants with flared legs. Sew And Go. Misses 8-18.”
Some examples of skirt lengths from the 1960s can be seen here. True mini-skirts were not generally worn until the mid-sixties. This Butterick pattern by Mary Quant appeared in October of 1964:
The hem hits just at the bottom of the knee, or slightly above. Over five years later, in 1970, Butterick’s chart still called this “regular” length.