But not a hat!

My MIL recently had a tumor removed from her breast, and is soon to go through chemo. I have the honour of helping her pick out a wig, but she said she also wants to buy some scarves, because when she's at home she will probably not wear the wig all the time. Does anybody have any ideas of something I could knit to cover her head? Something kind of classy, as I don't think she'd want to wear a toque around the house!

Any suggestions would be great.