Jabir bin'Abdullah (RA) reported that Allah's Apostle (ﷺ) reprimanded that a woman should add anything to her head (in the form of artificial hair).
Explanation & Benefits
Shaykh Maulana Abdul Aziz Alvi
Hadith Commentary: Benefits and Issues: According to the majority (jumhur), in light of other narrations, the meaning of "shay'an" (anything) refers to human hair.
Source: Tuhfat al-Muslim: Commentary on Sahih Muslim, Page: 5577