When did "dinks" die?

[nyapbp]

I have a 1969 yearbook from Southern Illinois University in front of me. "A bevy of white beanies identified New Student Week leaders at the opening convocations." Beanies were still being used for identification purposes but not to identify all the freshmen. I think they were totally gone by the early 70s in most places.

An older friend of mine who was an adademic advisor during the 50-80s called the introduction of blue jeans into acceptable campus wear as the great equilizer. I suspect beanie went near or about the same time that women could wear pants and/or jeans to class.