1988 peak hair?
maj writes in a comment:
I think you have to go still further in the decade – ’80s fashion got bigger and flashier as the decade wore on, and changes in fashion occurred much more dramatically and quickly in that decade than at any time since. If I had to guess I’d say peak hair occurred approximately 1988. Things started to calm down at the very end of the decade as the zeitgeist began its slow downshift into grunge era despair-chic.
OK, above is a picture of the tri-Delta sorority at University of Maryland College Park in 1988.
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And above, Demi Moore from St. Elmo’s Fire in 1985.