I knew I had the right button when I saw the Piper hat in Twist Collective Autumn 2009 .I first saw these buttons in an Art and Craft Fair in Oslo last August. Later, I saw that the museum shop at Maihaugen had started to sell these buttons, and that's where I bought this pretty dragonfly button. I tried to find a link to the museum shop, but couldn't find one. (You have a job to do, Tove! Here is a photo from the museum pharmacy.) You can see more buttons at Snella og Petronella. And here is my hat:
I used Garnstudio DROPS Silke Alpaca. It's very soft and nice, but lacks a little bit in elasticity. But I think I'll be happy with the hat. It's a great pattern, well written, and easy to follow. You can read about the design process on the designer Christa Giles' blog here.
I started out with the larger size, but I realised it would become to big. I'm so used to stranded colourwork, so I forget that stockinette stitch is much more elastic. So I omitted the last increase round, and it turned out ok for my 56 cm head (22 inches).