From the sefer “Avodas Pnim” which Peninim tznius groups learn worldwide- read, reviewed and approved of by Rabbi Yaakov Ephraim Forchheimer (Posek of Lakewood, NJ), Rabbi Dovid Weinberger of Congregation Shaaray Tefila, Lawrence, NY and Rabbi Usher Eckstein
On page 87 it says:
“It is a Torah obligation for a married woman to cover her hair whenever she is in a public area or appears among a large number of people. Chazal have given the hair of the married woman the status of ervah. This means that the hair, as is the case of any other part of the female body that is labeled ervah, can cause a man who sees it to feel attracted to her.
In the eyes of the halachah, a married woman is an eishes ish, which indicates a special and elevated status. When the Chasan places the ring on her finger under the chuppah, he says to her, “Harei at mekudeshes li- You are hereby designated to me.” The word “mekudeshes” means that she is now set aside for her husband. She has entered into an exclusive relationship with him alone and must be especially careful to avoid contact and socializing with any other man. Accordingly, part of her beauty should be withheld from the public eye. Certainly she should be dressed pleasantly and graciously at all times, but she should not display her full natural chein for everyone to see. This is accomplished by covering her hair, because the hair has particular feminine appeal.
Interestingly, the Gemara tells us that Chava had to cover her hair only after the sin of eating from the eitz ha-daas. Had she not caused Adam to sin, the yetzer hora would have been far less intense, and this symbol would not have been necessary. One the yetzer hara was internalized, it became a far more potent force, and it became necessary to safeguard her from all forms of immorality. Covering her hair to conceal its natural beauty became an extra measure of tznius to fight the yetzer hara of immorality.”
The wigs today are not concealing a womans beauty- there’s no argument there.
I cant understand what the point is of arguing about the purpose of the mitzvah of kisui rosh- Jewish married women are covering their hair for tznius- period (why else would we be covering our hair??). Most of todays wigs are not tznius because they are causing women to look more attractive, not less attractive- CASE CLOSED.