For this hat, you get to choose what you knit in the center of each “window.”
For the simplest option, pick your favorite stitch pattern and use it in each window.
Of course, you can use a different pattern for each window as well, as shown!
Knitting in the round; working cables and other patterns from charts. Pattern is charted only.
Cable Chart: Row 10, stitch 15 should be a purl
Alternate Ringlet chart: Row 8, stitch 7 should be a purl.