Until about 1965-66, when most TV transmission was in B & W, fashion and style were, let's admit, rather boring. But once color entered the home, it seemed like the USA went into a 10-year period of color hallucination.
For example, compare Ed Sullivan 1965 with Rowan and Martin or the Monkees, 1968. You'd think that there was a century in between, but there were only 3 years.
And the interst in drugs perhaps? Of course a draft that lasted for years and years while we grew up might have had something to do with baby-boomer escapism too.