Let's say that due to having different personal grooming choices, at least one of US President post 1970 end up in office wearing his hair long. And by long, I meant past shoulder length.
What is the likely effect of one of these Presidents sporting long hair when they sit at the Oval Office (let's say they still become President despite having long hair styled in ponytail or longer?):
Jimmy Carter
Ronald Reagan
George HW Bush
Bill Clinton
George W Bush
Barrack Obama
Donald Trump
...
What is the likely cultural effect of having long hair back in the white house? bonus points if there is logical POD where Long Hair (shoulder length or more) is back as formal style for men in 1980-2010s.
You could pick an alternate President of US too... but the rule is said president must be Male, due to simple facts that women with long hair are already very acceptable.