This is the finished hat. It turned out just that little bit small. And I think I might've interpreted the pattern incorrectly as there don't seem to be enough knit rows to curl the bottom edge up. So I gave it away. I am going to reknit on 6.5mm needles (thanks Jane-Beth!). I think that will make it just right (with the addition of more knit rows). I was pretty close guessing 6.0mm needles. Anyway, it's a quick project and quite funky. But I will probably need more wool.