By the late 60's, the hippie culture ruined the fashionable early 60's look. Men had wide lapels and longer hair with sideburns, women burned their bras and stopped wearing their elegant clothes. It was as if taste and culture were declining.
Mad Men really chronicled well how much things changed throughout the decade.
Those cool, swinging Early Sixties hipsters were a portent of what was to come. People wanted the cool, swinging lifestyle so much, and look what happened.