“This is one of the least discussed topics and yet perhaps the one that needs the most attention”
Modesty is the opposite of needing attention. Calling our attentions to immodesty, does not promote tznius. This is why most good Jews just stay on the sidelines. Those that are loudly promoting tznius, seem to think the same as those who are immodest.
I’m sorry if your really bothered by modern trends, but encouraging public discussion of such trends is counter-productive.