Sof Davar. Neck lines and hem lines are an aspect of tznius that applies more to females than to males (unless you feel it is exclusive to females and you have no issues with a male walking around in a tank top and shorts?). My point is however, that hatzeah leches is a lot more than neck lines and hem lines and it applies ot everyone. So, unless someone is a navi, stop making the claim that it is breaches in how females dress as the cause for all of klal yisroels problems.
Food for thought. If frum males had their priorities straight, would frum females even think about dressing inappropriately?
Perhaps it is not the fault of females how they dress, after all it is the fathers and husbands that allow their wives and daughters to dress how they do, so it is the mens fault.