It's more than shoes. The whole "observation of appearance" thing is freaky.
Based on what I've read, scientifically speaking, women's looks (facially) are higher on the evolutionary scale than men. Meaning eons ago, women had male facial features, and men looked quite brutish. So, women today can have female features, and men look like what we call masculine. Oddly, I am seeing some males today that sort of have female features. What this means to me is that women are just ahead of men on the evolutionary scale, and their ideosyncrasies are just the price we have to pay, as a species, to keep evolving.
But, the schtick with many shoes might reflect, in some cases, the awareness that more than one male is a foot fetishist. That is why they are wo-men (they wo'ed the man).