The early 70s were generally less fashion-oriented, and more realistic and down to earth, for the more aware people that is... more relaxed, less itching to make some stupid statement that would have to be abandoned for the next year's big stupid fashion statement. This wasn't reflected on TV because TV always took several years to begin to catch up with what actual people were doing.
Oblivious people though, as well as TV producers and executives, still thought fashion was around and "cool", and the smarter and more quietly "hip" were content to let them have fashion, and to let the normals do whatever they wanted to with it, because they just weren't interested. Just one more thing to laugh at.
So, "fashion" spun off in a weird direction, with no sane people left to put the brakes on the surreal stupidity. The sane had just started wearing jeans and sneakers, or whatever, and had moved on to something more interesting, like life. So we got leisure suits, which were worn by younger people for about five minutes (my smart, witty, engaging history teacher had these suits as his only flaw... my stern-- but good-- stone-faced chemistry teacher also dropped his funeral parlor suits for leisure suits that year!) but which almost immediately got adopted by the elderly.
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I was somewhat frustrated by CPs sticking of his toe into 60s clothing but never going all the way, bvut then I need to get late 1967-early 69, which I have no tapes nor memories of.
Me, I wish for the (faux) leather pants to have been upon Marie Wallace.
If I had a nickel for every minute of strife I caused for my family by dressing up as Abe Vigoda....