As has been stated before, often by me, this was never true. The men's uniforms were fine for the era, and by today's standard look maybe a little casual, but still work. The women's uniforms were not, I repeat, NOT, ever intended to be eye candy for anyone.
In the 1960s, skirts above the knee were brazen and far from demeaning to women. In fact, the whole intent was to force society to accept the idea that women weren't meek little churchmice, quietly doing the men's bidding and dressing to hide the fact that they were attractive. I've said recently in another thread that only those women who wanted them, like Nichelle Nichols, even got outfitted in skirts that came any higher than what today is called a midi length, just above the knee. Most were wearing the midi length. And everyone wore the "go-go" boots. There's even a closeup of Kirk's in "What Are Little Girls Made Of?"