DY: Nothing to do with “Fire and Brimstone”, but misrepresentation of Halacha. He disagrees in his S”HUT with the conclusions of his book (as I’ve pointed out in other threads). The book is not meant to be Halacha, but is unfortunately taught as the absolute minimum by many schools. Whether that was his intent or not, I don’t know, and I have no reason to assume malice on the part of an Orthodox Rabbi and can be Dan L’Kaf Zechus.
As far as the “middah” is concerned, you are only partially correct. Wearing baggy pants and a floppy hat with hair sticking out or showing elbows is following the “Middah” of Tznius, but not the Halacha (vs. driving an Infiniti or Lexus SUV in a full length dress is following the Halacha, but not the Middah). If the Halacha is not taught, then (as I said earlier) women think the whole thing is made up.