It’s possible that it is a more modern idea that we’ve attributed to being much earlier, that does happen a lot, but I’m inclined to think it’s not entirely baseless.

We know for example that the nude Aphrodite of Knidos by Praxiteles caused enough of a stir to become a tourist destination, and even she had a conveniently positioned hand covering her goods. Kore statues always had clothes on too, unlike their male counterparts.

I could maybe buy the possibility that almost all of the nude women sculptures were stolen and later destroyed, either intentionally or accidentally, but that doesn’t quite work either. To not find any older nude sculptures in modern times, plus the odd detail that none of the nude ones we do have (copies, admittedly, and I don’t know all the statues either) have anything other than Barbie-smooth instead of even a delicate line suggesting labia… seems odd for an art culture that progressively got more caught up with hyper realism.

They did get nuder and more realistic with time, but we’ve got nothing from the archaic period without at least a skirt on, usually more.