I made another hat for dad. The last one shrunk quite a bit. I made this one from Plymouth Yarn, their Encore line. This is "coffee beenz" (75% acrylic - 25% wool), color: quarry
To keep the roll of the brim under control, after 6 rows I did two rows of Knit 2 purl 1 ribbing. Very happy with the results.
Free Ravelry download: http://www.ravelry.com/patterns/library/basic-roll-brim-beanie