Even though I have made this hat previously, I haven't made it as one of my monthly challenge hats, so I thought I'd count it as a September hat and add the pattern link. It knits up quickly and you can use any number of color combinations. The pattern also offers suggestions for brim variations if you want different looks.
The pattern is available for free at i-like-lemons.blogspot.com. I used a partial skein of Berroco Comfort Security Blanket multicolor yarn and some stash in Cadet for the brim. The hat is knit on a 16" size 7 circular needle and 1 set of size 7 dp. Stitches used are knit, purl, and K2tog. This is one of my favorite patterns.