My sister has suffered from alopecia universalis for at least 25 years and found wigs very uncomfortable, hot and irritating, even natural hair ones. Consequently she has worn small head squares for all that time. Soft 100% cotton is all she can wear and thankfully these are fairly readily available. Of course, not all colours and patterns are to her choice but she lives with the problem, Hobson's choice as the saying goes.
Years ago she would have happily made her own but she has severe Rheumatoid arthritis and can do longer do anything which requires dexterity.
Perhaps if she has colour and pattern options to co-ordinate with her apparel it may help.
Soft cotton knits I a 'beanie' hat style may also be a option, maybe bamboo fabric?.
I know my sister was very conscious of her bald nape and she wore the headscarf tied at the back and that detracted a little from area.