womens clothing to me is about fantasy and role play, and IMO of course over the years they've pulled in menswear 'elements' but have usually twisted them so far that they're just fashion fun. I see women trying to wear pant suits and their sleeves hang over their hands, they have soft collars, and pull their collars over the jackets like 1970's greasy chain wearing balding dudes, etc.
Example of dos and don't. It's one thing to have a wider trouser leg to accommodate hips. It's like a guy adjusting shoulder pads for his build. A wide or even slightly flaired leg isn't something you're really find on a mens suit, but to me that sort of change makes sense because it's a part of making it function for the wearer. Like changing the rise, or button placements, etc. But when you start rolling up the sleeves, or making super cropped jackets, etc, then it moves into fashion. Now IMO there's nothing wrong with that, but call it what it is. I guess plenty of guys walk into Thomas Pink and peacock it up with their shirts, ties, and PS's and socks etc, so how is it different when women do it, but I still feel unsure about this one, at least in the context of trying to do actual menswear.
what I'd really like to see is good honest attempts by women to wear fairly traditional menswear. Meaning fabrics, somewhat traditional cuts, etc.
edit - like the post above, exactly. Meaning it's really pretty much menswear, with some adjustments for body type etc and some preferences, but it's not costumy IMO.