I’m a fanatic of the 1960’s and I can promise you that baseball caps were normal then, especially for young people (kids-late 20’s).
They aren’t wearing em in the pics you posted because those are all ad’s for clothing and the company doesn’t make baseball caps.
I’m not talking about young people, though. I don’t like young people.
Here:
These seem to be the situations a person would wear a baseball cap in the 1960s:
- Recreation
- They’re young
- They’re generally not middle class citizens