Health: I never base an opinion on what other posters post. And I’m not necessarily talking “To’eles” as in from Dinei Lashon Harah. I’m saying there’s no purpose in it, so why would you say it? It also shows an extreme lack of Ve’ahavta L’reiacha Kamocha.
Besides, we all have no idea what this “breach of Tznius” was. I am assuming that it wasn’t a gross breach or Ski would have left the wedding. If she was Mamash Halachically not dressed then I can see the comments being Muttar, if still even a bit out of line. I am assuming that this “breach in Tznius” was something minor that is probably not visible at most times.