BS”D
ames, wearing stockings is not halacha, simple fact, they didn’t have stockings back then. It might be minhag hamokom, but it’s certainly not halacha.
Her rav told her it is halacha (as would mine if I were female). Therefore it is halacha. We did not have electrical appliances “back then”. Do we therefore not use them? No, we are thankful that we have stockings so we can keep better tznius (and who knows that there was not something like that back then), and we are thankful that we can use appliances to lead better lives.