Sartorially speaking, the 70's may have had some of the weirder stuff, but the 90's were just flat-out bad.
I blame the Dot-Com bubble.
Before that, the suit was a symbol of success and power, but when the successful and powerful people began to wear t-shirts the dynamic changed.
Ultimately, however, it's all about what the average person associates with "freedom, individuality, and self-expression."
The Vietnam/Watergate era caused more people to...