Maybe.
But this (absolutely awesome) photo from Joe Sikoryak via Lukas Kendall’s blog tells a different story from the same time.
This is an early Trek convention photo from 1974. The thing that struck me, beyond how amazing these costumes are, before anyone called it “cosplay” (God, I despise that term), is that most of them are female. And fairly attractive by conventional standards by the looks of it too. I guess they’re still what people would call Nerds, but if I were the right age in ‘74, this is exactly where you’d find me trying to meet the Rand to my Kirk.