Lubavitcher Rebbe and the wig (sheitel)

The modern controversy surrounding wigs that are worn by Jewish women brings to light its issues. We know what many Rabbonim say about the modern wig: Rav Yosef Shalom Elyashiv, zt”l, Rav Ovadia Yosef, zt”l, etc.

What did the Lubavitcher Rebbe actually say about the wig?
The following is the short video:

The following is the long video: