You are right, that is an issue which ultimatly affects women as well. But that does not mean men and women (outside of husband and wife) need to discuss it. Truth is, I find it somewhat strange that Rabbonim should be the ones to discuss the particlars of tznius with women and girls. It should either come from a rebbetzin, or if it needs to be said by a rov, it should be directed to the father / husband and have them relay it to the women in thier lives.
Some topics simply do not cross the gender lines in our community. I can voice my opinion, but to engage another women in a debate of what should and should not be exposed in the street? That’s out of bounds in my book.
As for tax-evasion (or tuition evasion) that’s a pretty neutral topic, so I’m ok with that in a public setting. Tznius is a toss-up. But? (sorry, I can’t even bring myself to spell it out), that is off the charts.