Use short row shaping to knit a hat flat on straight needles, plus some increases and decreases to make the wave design. My first self-published pattern, this one is a great way to learn short rows and can look very different when knit with a self-striping yarn, a variegated yarn, 2 colors striping, or wedges of different colors.

Size: adult medium

Yarn: around 90 yards of aran weight self-striping, or multiple solid yarns striping

Needles: pair of size US 10 1/2 straight, optional set of double points for the top

Gauge: 4 stitches/inch

Skills needed: short-rows, provisional cast-on and either 3-needle bind-off or kitchener stitch, make 1 increase, k2tog decrease, optional picking up stitches and knitting around on double pointed needles, with optional i-cord

I wrote a tutorial for two different ways of striping on Craftstylish.