Girls didn’t wear pants in the 50s even when they came out to observe street racing, they wore dresses.
Pants weren’t even allowed by girls in school under any condition.
I can’t speak for the 60s since I was too busy running a business to give a damn.
From your post i’m old enough to be your father since I was married in the 50s.
That age comparison sounds right.
I have a photo of my mother in the early fifties, wearing jeans, with a bonnet on her head and a hoe in her hand, chopping weeds out of rows of cotton. I’m pretty sure that is the only situation in which she would have worn pants until the early seventies.