Regarding socks and R. Falks’s book. Reb Moshe clearly says as long as the knee and above are covered, one doesn’t need any socks. He says that since they are only a chumra, anyway, if one wants to wear clear stockings, she certainly may, as they are not necessary to begin with. However, he doesn’t recommend wearing clear clothing on areas which may be ervah, since that might lead to hirhur.
However, R. Falk’s book goes into a long discussion of what color and material are permitted for socks. (He even has a problem with certain dark socks because one might see light reflecting through them more noticeably than through lighter socks.) Seemingly out of thin air he manufactures an entire shulchan oruch. All this for a garment which is unnecessary to begin with. It is for reasons like this I totally lost faith in his book.
One additional point, this business of blaming frum women for the lack of tznius and constantly forcing even more chumras on them will not make it any easier for Jewish men. Has anybody ridden the NYC subways lately? Even the most modern Jewish women don’t begin to compare to what the average subway rider is (or is not) wearing. Believe me, nobody is paying a drop of attention because a frum woman is not wearing thick enough socks. There are far worse distractions all around the train. Let us give credit to all frum women for being so careful with tznius instead of screaming at them that they are only covering 95% of their bodies.