The very frum women never revealed their knees and elbows in public. Not 60 years ago, not 30, and not now. There were shomer shabbos women 60 and 30 years ago as well as now that publicly display their knees and elbows and above. They are doing an aveira. Now. 30 years ago. And 60 years ago. The same a aveira. It wasn’t any more correct then than it is now. And there were very frum women 30 and 60 years ago that would never reveal their knees and elbows in public. Even when sitting.
