This hat only took 31 grams of yarn. You could easily make one out of that stray single skein of Koigu you have lying around - or is that just me with the stray Koigu?
I asked the Hubby why he liked this pattern so much, specifically for his friend. He pointed to the top and said "for the birds". It took me a moment to remember that his friend is a huge bird watcher and he meant that the birds would get to see the interesting part. Sometimes my husband's brain works in the most delightful ways!
I ended up doing a Google search for "grafting garter stitch" through which I found this link on Purlwise. The technique she outlines worked very well and you really can't see the seam on the right side . On the underside it has a little bit of a ridge which is not particularly visible, but which does feel different from the rest of the fabric.
Overall, I still love this project and will keep this one in the stash of "go to" patterns because it is so quick, versatile and relatively entertaining to knit.