I found this fun tutorial for a hat.
My mom wanted me to make her another cowl and I thought this would be perfect. If you want a neckwarmer, you simply loosen the drawstring and pull it around your neck. If you want a hat, you cinch the drawstring and make a hat.
Of course, my mom said she might need a neckwarmer and a hat, so I made two.
I followed the pattern, but found the stitch difficult so I used a hdc stitch in the back loop instead. It creates a stretchy feel to the end product. Here is a video that shows that stitch.
My mom purchased a really soft merino wool by Malabrigo. It was really nice to work with too.