A full pattern for this hat can be downloaded for free from the Ravelry Store:
Not wanting to waste an inch of Angie's beautifully dyed merino wool here's a hat to match Wendy Bernard's Sailor's Rib sweater (Interweave Knits Weekend 2009). It took me three attempts to get a hat that fit out of the samll amount I had left - as you can see it is a snug fit - but used every last drop of wool.
Sailor's Rib in the round:
Rnds 1 & 2: k1tbl, p1, k2, p1
Rnds 3 & 4: k1tbl, p4