I read through the teshuvos and your answers, so my understanding: “shok b’isha erva” is below the knee, above the elbow is erva territory, and the covering borders follow the custom of the place (Aguda, Lechem Chamudos). You also answered that where hair covering is not done at all, even among the frum, not covering is halachically fine.

Two things I can’t square. Women dressed totally differently 2,000 years ago than 100 years ago in Europe, so a European standard was never the Torah’s standard – and inside the sources themselves, even the Mishna Berura’s stricter line on the shok traces to the Bach, who retracted it himself. Ok.

So here is my question: on a secular college campus, shorts and tank tops are what everyone wears – not what people consider ok, what they actually wear, and everyone around them dresses the same. Does that count as the local custom such that wearing the same is fine? Or at some point is the custom itself immodest and the halacha overrides it – meaning there is a fixed floor (above the knee, above the elbow) that no custom can drop below? Because if custom fully decides, even a beach-town bikini custom would erase the inyan of erva entirely, and then “the halacha says immodesty” would have no meaning anywhere.

Thank you Rabbi.