When I was a kid growing up in the 50s nad 60s, just about every guy wore blue jeans.
We called them all Levis tho thinking back, probably more of us wore Wranglers. They were of equal quality and sold for a bit less.
I forgot, Lee brand was also popular.
I received exactly 3 pair of shrink-to-fit levis each year. Two pair at the start of school with the pants cuffs rolled up about 4 inches. Later, in 7th grade, l learned how the cool guys rolled their levis up on the inside. They denied that they were hemmed, but I was always suspicious.
By Spring time, the original 2 pair were well used and no longer had to be rolled up, partially due to growth, so a 3rd pair was bought and by the time summer started, the original 2 pair became summer cut-offs. That pattern repeated up into high school.
I was a die-hard 501 guy, knowing what size to buy, then wash them several times to get them shrunk down to be able to wear.
Upon arriving on the East Coast and having Casual Friday implemented at the office, it was obvious of the eastern snobbery, for the policy for casual clothes barred denims.
To this day a person in a sharp pair of Levi's is well-dressed to me.