Simon, I respectfully suggest you take another look at the WT outline under discussion.
It is NOT about immodesty per se. It IS about the WT leadership's perceived "gender-blurring" and subsequent stereotyping based on a person's clothing choices and physical mannerisms.
This matters to many of us. Perhaps we are dealing with these issues ourselves and for whatever reason still attend the meetings. Or maybe, as in my case, we have loved family members that are still in the cult and we worry about them being persecuted and judged by self-righteous elders on an ego trip. Directives like this give these elders a false sense of legitimacy to start a witch-hunt, or in this case a "gay-hunt."