I finished this hat to give to my uncle this Christmas. He's a fisherman, and I think it's oh so appropriate! I tried it on and have decided that I will need one too (knit in the next size down) once I'm finished with all the other gifts I've planned.
Here's the pattern I used, with little modification.
add a turned up brim
Follow the pattern for Declan's Hat by Samantha Kirby. Instead of 3.5" of ribbing, continue until you have 5.5" to 6" of ribbing so the brim can be turned up. This will probably mean you need more than one skein of yarn.
Continue with the pattern as written.