This is a PDF of a hat knitting pattern. The hat has a brim circumference of 18" (45.5 cm) and has a height of 9.5" (24 cm). NOTE: To fit average adult; brim will easily stretch to approximately 22" (56 cm).
This was the first hat I designed when I decided it might be fun to try designing hats. I loved the process from beginning to end, and couldn't help designing a bunch more hats. The stitch pattern is very basic; it's a 2-stitch column that shifts 1 stitch to the left every other round. You can change the length of the hat to whatever you want it to be.