This classic hat starts out knitted flat, on size US6 16-inch circular needles, and then, is joined to knit in the round on size US7 16-inch circular needles. Sizes: doll, newborn, infant, toddler/child, teen/small adult, adult, and large adult. There are so many ways to make this pattern your own unique Hattitude Button Hat. You will need 100-200 yards (50-100g) depending on size, and a small amount of any fun accent yarn. You will also need one large button, 2 medium buttons, or 3 small ones. Gauge should be 5-6 stitches per inch. The possibilities are endless! Have so much fun and I sure hope you share photos!