I think the way I phrased "band kids" was a bit off target. But I was mainly aiming at the use of "teenagers" who are mostly in high school and not college. I was getting at well funded music and arts programs across public schools in that era within the US. Middle and high schoolers exposed to that by either playing in bands, attending recitals, shows etc may have sparked interest or played a role in that revival. Those kids would then carry that interest forward as they aged for at least a few years.
Fashion I know next to nothing about but non-baseball hats were definitely more popular back then and more accepted across a wide demographic in comparison to now.
But this is all off the cuff guessing really. The real answer could be vastly different.