Answered by our Shaykh, the ‘Allaamah, the Sincere Adviser, Abu ‘Abdirrahman Yahya bin ‘Ali Al-Hajoori – may Allaah preserve him –
What’s the ruling of bald women wearing wigs?
They’re to wear a hijāb or a khimār to cover their head. This is better than wearing wigs which are zūr (falsification). If she was to be afflicted with a condition which caused her head to lose its hair, she should wear something of clothing which would cover her head.
Translated by : Abu ‘Abdirrahman ‘Abdullaah bin Ahmed Ash-Shingaani
الكنز الثمين في الإجابة على أسئلة طلبة العلم والزائرين (4 (https://www.sh-yahia.net/show_books_39.html)
Under: كتاب اللّباس
Entitled: حكم لبس الباروكة