However, for us Midwestern teenagers in the 70’s, during the era of mandatory shoulder-length hair, there was no hat that would not make you look like a dork:
Wool watch cap? “aw, did mommy bundle you up?” Baseball cap? Hell no: stoners and jocks were different species. Baseball “seed” cap? Ditto, per farm kids. Fedora, razor-bill flat cap or beret: risibly affectatious, reminiscent of the recently-passed hippie era from which we strove to distance ourselves.
And, to avoid bed-head, you had to wash your hair in the morning, then walk to school in sub-zero weather bareheaded with wet hair. So you had to have a car, or a steady supply of weed so you’d be offered a ride.
I think the analog for women is pantyhose. That’s even more recent: it certainly happened in my lifetime, but I have trouble describing exactly how it happened.
Mary was in Minneapoli, Minnesota in the Fall. Hats were (and still are) mandatory in Minnesota for several months of the year. For practical, not fashion reasons.
We have a name for fools who don’t wear hats in Minnesota winters: pneumonia patient.
I heard Princess Diana appearing at Royal Ascot in the early '80s without stockings was a watershed moment in that it was seen a signal they were no longer de rigueur.
I’m not sure how true the story is though (the cultural impact part of it, specifically).
Fellow Joneser here, and I agree when I consider the amount of superficiality there was about things like hair length. If you were a guy and you didn’t wear it long you were one of “them”, the conservative silent majority. You couldn’t be taken seriously. I wore my hair long and was certainly guilty of the same kinds of prejudiced thinking. By contrast, today, I see young guys wearing hair in all sorts of different styles and lengths and it seems to work for them.
Like most youth in any era, we wanted to distance ourselves from our parents, but as you pointed out we also had to distance ourselves from the pre-Jones Boomers*. In many ways the culture and music of the psychedelic era had been flamboyant, almost by definition, in the 1970s everything toned down visually and musically. IMHO music started to get really boring around then.
*Gen Jones: second half of the Boomer cohort, born about 1955 - 65.