Peah Nochrit (wigs)
This is Absolutely Forbidden!!!
There are more than 20 poskim who say that this is completely forbidden, it is absolutely forbidden to go out of the house into the public streets wearing a peah nochrit (wig). It is just as if you are going out with a completely uncovered head. Just like it is forbidden for a married woman to go out with her hair uncovered, it is equally forbidden for a married woman to go out with a wig on.
There was a great gaon, Rebbe Pinchas Horovitz, a world sized giant, Rebbe Pinchus Leibush Horovitz, he took his beit din with him and they took a Sefer Torah with them and they pronounced a cherem (a decree of excommunication) on any woman who would wear a peah nochrit (wig). Who can violate a cherem of a man as great as this?! He was a giant, a giant in Torah… To violate his cherem… Who would violate such a persons' cherem? This is in addition to the fact that there were many Gaonim who have written explicitly that wigs are forbidden.
The Gaon of Vilna writes in his sefer on the Mishnayot explicitly that wigs are forbidden.
The Gaon Yaabetz writes extensively in his sefer 'Mor Uktziah' and in his sefer 'Tshuvot Yaabetz' very explicitly that wigs are absolutely forbidden!
The Chatam Sofer writes, "After the Gaon Yaabetz has thusly said, it is certainly necessary to forbid wigs."
The Maharif Chiyut in his sefer 'Ish Chiyut' writes in one of his teshuvot (halachic responsas), "It has already been forbidden by the greatest of the world and there is no room for leniency in this matter. Only the apikorsim (heretics), the minim and apikorsim are the ones who are lenient in this matter. Everyone else is very cautious in this matter."
Rav Chaim MiSanz writes in his sefer 'Shu"t Divrei Chaim' as follows, "It is the actresses, wild and immodest women, they began with this practice. Many have learned from them, we have mixed with the goyim and learned from their ways."
To my great sorrow, I have heard of many good girls who would prefer to wear a cloth head covering, and the boys, those learning in the Yeshivot are making conditions not to date them unless they commit to only wearing a wig after marriage. What Yeshiva students are these? These are ignoramuses, fools, wicked people! They are defaming the name of Hashem. People who ask for things like this learn in a yeshiva?! What Torah are they learning? They will have to face judgement for this in the future.
The author of the sefer 'Atzei Arazim' in Even Haezer writes, "I am certain that any Rav who is lenient in the matter of wigs will have to face judgement in the future!"