16" [41 cm] brim circumference
osprey / split pea 1 / skein
set dpns in size US 10½ [6.5 mm]
17 sts and 24 rnds = 4" [10 cm] in pattern stitch
Hat is knitted in the round from brim to crown.
Alternate cable cast on (link provided), working in the round, increasing, decreasing. Charts and line-by-line instructions included.