Joseph:
My point was not only that girls, being that they are so sensitive when it come to their clothes, will not be accepting of mussar so fast, but also that I feel it is inappropriate and lacking tznius for a man to comment on womens clothes. Don’t you hear that? Do you feel comfortable saying to your neighbor/sister-in-law/cousin, “You know your clothes are too tight. I could see your form.” ?
I will not comment any further on the sefer, but I will say this as regards to your comment: “Our Rabbonim have been specifying the boundaries of dress from time immemorial.” al pi halacha there are 5 areas of a women that are halachically considered ervah (including kol isha and married womans hair). That is the extent of what or rabbanim have been specifying from time immemorial.
What is construed as tznius or lacking therof TODAY is largely “gray area”. So, a sefer that goes into specific details may be helpful to some in some areas in our days, but may not be applicable everywhere, for everyone and for the next generation. i fear that there may be much that, as a man, you are not familiar with in the concept of tznius for women.
I will be the first to tell you that it is certainly a huge problem today, and a great challenge for our girls. But approaching it by giving “tochacha” is like applying a bandaid to a tumor. It just covers it up, but does nothing to address the underlying issue. Girls dress the way they do for a host of reasons, and educating them about the beauty of tznius in concept–as apposed to clothing–is dealing with the roots, as apposed to the symptom.