As much as many will assert (from their cultural viewpoint) that the kilt is manly, other cultures will assert the kilt is a women's skirt. Why do you think the Highland troops were called "ladies from Hell" by their adversaries? Not everyone shares the same gender perceptions.
It's the same as scent. (Many a young boy has tried his mother's perfume because it's "pretty." Adolescent boys then buy scent according to the marketing, i.e. "machismo," of his scent.) Marketing is a social construct, and has no basis in nature.
(P.S. I will say again that I *like* the kilt...)