Kasha said “he then says that stockings are required only because of tznius — because if it was actual ervah than transparent stockings would still be prohibited.”
“Tznius” meaning what? If it is not an Ervah, what is considered “not Tznius” in one time and place is not neccesarily to be considered so in any other.
Kasha said”However neither Rav Moshe nor the Mishna Berura state that there can not be hirhur concerning the lower leg.”
There can be Hirur on any part of a woman’s body, The areas that are an Ervah she has to cover. (She also has to make sure not cheapen herself even while covering all Ervah. However this is subjective and what is considered “cheapening” will vary greatly from Era to Era and place to place.)