This hat incorporates the fisherman rib pattern from Purl Soho. The stitch makes an extra squishy fabric that’s very cozy for a hat. The hat is worked flat and then seamed. The resulting fabric is also quite stretchy, and I imagine the hat will stretch as it is being worn, so the CO stitch count is conservative, and it fits my head comfortably (21″). But I’ve also included instruction for a larger size in parenthesis.