In an article in the 5 Towns Jewish Times, he calls attention to a serious problem, that of women dressed inappropriately when dropping off their sons at Yeshiva, because they are heading for the gym and are dressed for exercising.
Among other things, he writes:
"What further complicates the issue is that many women are entirely unaware of the problem. They do not know that it is the nature of a pencil skirt worn with leggings to rise above the knee."
The problem, actually, is that Rabbi Yair Hoffman spends enough time thinking about this so that he knows what a pencil skirt is (I don't) and is familiar with the details of leggings "a nylon-lycra blend" and that pencil skirts are apparently made of spandex. He also apparently thinks deeply about the necessity of "a skirt that entirely conceals the shape and form of the thigh"
When do we start telling the truth, that rabbis who are obsessed with women's clothing seem like fetishists?