Scarves/style for chemo patients

Has anyone experienced hair loss from chemo (or any reason!) or has a close family member who has? My mom is losing her hair and made the decision to shave this week. She is worried about how it looks and her head getting cold. She has a super cute winter hat but what about indoors? I’m looking for maybe some pretty lighter weight scarves she could tie up? I️ have no clue what to look for or how they are tied. Any advice please!!! TIA