Not in the West and Midwest. We mostly couldn't afford them.
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But the buckskin would have been expensive. Unless it was a gift to her, she likely could have worn fashionable jeans if she wanted. Even in the street scene of Boulder in the 70's we liked trendy jeans but buckskin was pricey and not affordable to most. There were plenty of trendy brands aimed at the younger crowd that weren't Calvin's or Vanderbilt. I still have 2 pair of jeans from back then that are more than 40 yrs old.