I've knit this slouchy hat, the "Meret (Mystery Beret)" by Woolly Wormhead, in 100% acrylic. It is destined to be a Christmas gift for someone who finds wool uncomfortable due to very sensitive skin.
The over sized nature of this design makes it very comfortable to wear.
It can be worn in quite a variety of ways depending on the preferences/personality of the recipient.
I like it a lot and may decide to make one for myself, but in a different colour and a much nicer fibre!