Scarves, Caps And Wig For Cancer Patient?

I need to buy some caps for sleep, scarves and a human hair wig for a cancer patient (my mom).
I’m looking to buy this stuff on-line(E-bay, Amazon). My mom is overseas, so she can not try scarves wigs on. I will mail everything to her.
I read that skin on head becomes very sensitive when hair is disappearing.
What are the best and the most comfortable scarves, caps and wigs for patients that go thru chemotherapy?