There's a strong desire in the queer women community (not all, but some) for clothing that's not "typically feminine." Some businesses have been slowly catching on to this, it's a slowly growing industry. Definitely a user base for such a thing.
Less gendered clothing styles are definitely more popular! But isn't it true that not typically feminine clothes still have to fit more feminine bodies?
These are "masculine" outfits that could be worn by anyone, but if I were to take the exact articles from the backs of these men and tried to wear them, they wouldn't fit. I'm shorter, have narrower shoulders, and different hips. So there's a user base who would like clothes like that, but there would still have to be a women's section (or a way to indicate what clothes would probably fit women-type-bodies) and a men's section, even if the styles were the same.