How was fashion created between 1960 and 2000?
Generally speaking, fashion is reflective of the society from which it is born. Regardless of the decade, fashion often times is a response to the political and socio-economic realities of the day. For example, women's fashion of the 1920's included 'bobbed' hair styles and gradually shorter and less restrictive dresses. These changes in fashion mirrored the changing moral and social perspectives of what is acceptable in popular culture, thus in society.
Between 1960 and 2000 fashion has undergone several transformations. For example, the 1960's usually labeled the 'decade of change' saw men wearing 'colors' something that was unheard of just a decade before, remember the classic 'The Man in the Grey Flannel Suit' an expose of middle class America during the 1950's. Men's hairstyles were changing as well. Even if it wasn't 'long hair' many men grew their hair longer than they had ever done before. People were experimenting, pushing against the status-quo. Ironically, this mindset would challenge much of American society; the vietnam War, women's rights, Gay rights, etc.
The fashion of the 1970's, 80's, 90's and into the 21st century were reflective much the same way. While the fashion might have changed throughout the decades, the reasoning for the changes are connected in that they are a reflection, a snapshot of the society.