Yarn: Green Mountain Spinnery Weekend Wool (100% wool; 140yds/128m per 2.12oz/60g skein) or Wisconsin Woolen Spun Worsted Weight (100% Merino/Corriedale wool, 250yds/229m per 3.53oz/100g skein), sample shown in Wisconsin Woolen Spun Worsted Wool in Penny.
If substituting yarn, I suggest one without too much variegation in color or variation in the thickness of the fiber. A wool with some elasticity in a heather, a tweed or a semi-solid colorway would be my recommendation.
Gauge: 22sts/28rounds per 4”/10cm in stockinette
Needles: US 6/4.0mm
Sizes:
18"/45.75cm around head.
Ribs allow one size of hat to fit a 19-21"/48.25-53.25cm head.
Yardage:
225yds/206m