The adult large is very large, it’s meant to fit a 24”-26” head! The medium size should be adequate for most adults.

Errata on the download:Gauge should read;20 sts and 30 rows = 4” (10 cm) over St st using smaller needles. About 6 sts and 30 rows = 1” in 2X2 rib unstretched. One 12 st cable repeat (using larger needles = 1 7/8” wide.
Sizes: Small; baby to small child, Medium; large child to small adult, Large; large adult

BEFORE STARTING
Yarn I used: Berroco Ultra Alpaca Worsted / 10 ply (9 wpi) Yardage: 215 yards (197 meters), Unit weight; 100 grams (3.53 ounces) 50% Super Fine Alpaca 50% Peruvian Highland Wool. For the 2 smaller sizes 1 hank is more than enough. For the smallest size about 150 yards, for the medium size you’ll need about 175 yards, for the larger size you’ll need about 250 yards of any worsted weight yarn.
Needle size: US 7 and 8 or (4.5 - 5mm), 16”circulars, and US 7 (4.5mm) set of double points.
Notions: St markers, cable needle, yarn needle.

This hat is knit inside out.
Thanks to Chris Kramek (FlourKnitter) for being such a gracious model and all the rest of the South End Knitter’s for being so supportive!