Let’s try to analyze this logically. What is the impetus for the stringent requirements of tsnius? In a world with no men (or a women’s locker room for the sake of a realistic example) is there a different standard? If you answer yes, that means at least some of the requirements of tsnius are to avoid provoking men. If you answer no, please explain the double standard.
I see at least two schools of thought emerging here. One appears to be an expression of outrage against men, decrying the need for women to act/dress differently than they would otherwise have to, merely due to problems that men have. If it is men that have the problem, then men should be the ones who have to fix it, not women. I personally find this way of thinking to be quite appalling.
Another school of thought is that the same Creator who gave women physical (and other) characteristics that are attractive to men, and the ability to ensnare men, also commanded them to make use of an appropriate “bottle stopper” to keep their powers in check. With great power comes great responsibility (as my wise uncle used to say). A similar example is tzedaka – a wealthy person has (financial) powers and the same Creator Who gave him those powers commands him what to do with them to alleviate the weakness of others (who lack the means to live at a proper standard). In the past it may have been more obvious where to draw the line in behavior and dress (“V’hatznea leches im H”E”, “B’chol drachecha do’ehu”), but it is very clear that in today’s world, clothing designers are purposely seeking to be on the wrong side of that line (most designers are men, after all) and they are affecting everyone’s judgement.
To some degree, black and white rules are needed now, in face of the anarchy found in the world of fashion. And to some degree, men may be needed to participate in setting these rules (due to halacha and mesorah passing from man to man, and the degree that the requirements are for his benefit), albeit the participation should be INDIRECTLY. [In my opinion, men have participated thus far as much as will ever be needed and the future can be left to capable women.] I tend to agree with SJS and the others who have stated that the approach to teaching tsnius requirements taken thus far may have been flawed and an improved approach must be implemented.
I think it should be obvious that any man who ever leaves his home is going to be challenged in this regard whether or not every Bas Yisroel is 100% up to the standard or not, simply due to other people in this world. If I have an urge to steal, there will be some stores that have cameras to prevent me and some that have none, and regarding those stores it is entirely up to me to prevent myself. So, in my opinion the men’s job here is DONE (except for giving encouragement to wives and daughters). Women should take responsibility for themselves, and men should take responsibility for themselves. “Kiruv rechokim” should be left to women.