I think of this as analogous to the movement to get women to wear pants. It's not that we wanted them to present as masculine; it's that we wanted pants to stop being masculine and start being just clothes. Basically all masculine coded attire became androgynous, but almost no feminine code attire did.

It's not like skirts are inherently feminine either. There are plenty of examples across cultures and time of it being perfectly normal for men to wear them.