I’ve written up the patterns in the size hat to fit my head (23” head) but I’ve included the gauge so you can easily figure out how many stitches you personally need if your head isn’t as large as my gigantic melon is. Although you need to keep your stitches as a multiple of 11 to work with the K3, P8 ribbing

One person has knitted this hat and said they had no issue with the pattern, so hopefully it is issue free as it is the first time I wrote a pattern for something I knitted as I went along.