
This is more of a recipe than a strict pattern, it is easy to adapt to different size yarns and different sized heads. For this hat I used Bulky weight yarn and a size P hook. Skein was 125 yards, I used a little over half of it.
Stitches used are chain, slip stitch, single crochet and hdc (half double crochet).
Chain 4, join with a slip stitch. Chain 2, work 7 hdc around ring and join with slip stitch.
Chain 2, 1 hdc in joining stitch, 2 hdc in east stitch, join with slip stitch.
Chain 2, 1 hdc in join, 2 hdc in next stitch. Repeat 2 then 1 around circle, join.
Chain 2, 1 hdc in join, 1 hdc, 2 hdc, repeat around and join.
Continue in this sequence, adding one more hdc before doubling up until circle measures 6-7 inches across. This will form sort of a bowl shape. Then work even until hat is desired size, this will make hat shape. I usually stop when it measures 9 inches from center to rim. Single crochet the last round, joining with slip stitch. Weave in ends.
Optional ideas, if you like the ridges around the bottom of the hat in the photo just crochet in the back loops the last couple of rounds, then turn inside out when done. Sometimes I do the last round of single crochet in a contrasting yarn.
To use a finer yarn and smaller hook just use the same method of increasing, doing 2 in each stitch, then 2 and one alternating, then 2-1-1, then 2-1-1-1, etc. until the top is 6-7 inches across. Then work even until hat is desired size. Once you learn this pattern you can whip out a hat with any yarn without a pattern, and it is a great way to use a one of a kind yarn.
Have fun!