benignuman –
As the Rema (EH 25:2) paskens, the ikkar halacha is not in accordance with the Shulchan Aruch in OC you cited. R’ Yochanan in Nedarim (20b) dismisses that opinion. Also, interestingly, the issur mentioned in the Shulchan Aruch is about histaklus, not re’iyah.
Let’s be clear. You yourself cited Shabbos 64a-b as the source of the issur to gaze at the ???? ?????. If we just look at that Gemara, we see the formulation of the issur is a complaint about the people ???? ?????? ?? ??????. Rashi explains ???? ???? ????? ?????? ????. What we see is clearly not some gezeiras hakasuv saying there’s a sheim ervah to the etzem zach regarding which an issur will magically be chal when someone looks. It is about pleasure being illicitly derived. Being “satiated” by looking. The formulation of the issur is that a ????dike re’iyah is bad. This is why a doctor may look. This is why me’ikkar hadin there is nothing wrong with ??????? ????? ????? between man and wife.
If someone lives in a community where sleeveless is common, then it is mutar.
Interesting. I’m glad to see we’re on the same page here.
Comes along R’Chisda saying “shok b’isha erva.” Is R’Chisda arguing on R’Yitzchak? There is no indication that this is a machlokes. If there is no machlokes, what is R’Chisda adding.
This is takeh a good point. I disagree with your conclusion though. If you are right, why does Rashi limit it to an eishes ish? And furthermore, again, what in the world is the svara to make certain things “ervah be’etzem”??* Also, the other things – hair and singing – are clearly derived from the pesukim by noting their hirhur factor. Is the Gemara jumping back and forth? (BTW in case you are not aware, the Aruch Hashulchan famously paskened in his day in OC 75 that hair is not ervah. So he certainly didn’t learn like you.)
*I can think of only one reason why something would be ervah be’etzem. That is a different kind of ervah, the ervah of ???? and the like to which the Gemara applies the verse ??? ???? ?? ???? ???. Interestingly enough the pasuk in Yeshaya is talking about ervah in this context. But this would obviously only be a davening issue, it’s not something you can extend to hilchos tznius.
Legs are a separate matter.
Bottom line: You are saying a chiddush in the Gemara. I think it is a major dochek, and I think the pashtus is that ervah defined by one subjective standard: what generally causes hirhur. Ayy your kasha what R’ Yitzchak is coming to add? Mir shtarbt nisht fun a kasha. It’s not enough to say such a chiddush which there is no svara for (you haven’t provided any). We’ll have to think of a better answer.