From pattern:
The unusual Coin Cable plays a starring role on this hat, running not only around the bottom edge, but in vertical columns; simple ribbed sections set off the coin cables. Crown decreases are worked mostly within the plain ribbed sections, allowing the coin columns to extend almost to the very top of the crown. Worked in the round, this hat knits up quickly in a heavy worsted yarn. I used Adrienne Vittadini “Trina,” a wool/microfiber/cashmere blend, on needles one size smaller than suggested for a tighter fabric; possible yarn substitutions include Malabrigo Worsted (wool); Blue Sky Cotton; Cascade 200 (wool); or if you feel like splurging, Lobster Pot Yarns hand-dyed cashmere.

Difficulty
Intermediate: skills required include knitting in the round, cable knitting, decreases, and reading chart.

Materials
Yarn: Heavy worsted weight yarn, 100 (125, 160) yds. Shown in Adrienne Vittadini Trina (55% merino wool, 35% microfiber, 10% cashmere; 71 yd 65 m/50 gm), red #112, 2 (2, 3) skeins.
Needles: 1 set U.S. Size 8 (5 mm) double-pointed (dp) needles. Optional: 1 16-inch circular needle, U.S. Size 8 (5 mm). Adjust needle size if necessary to obtain the correct gauge.
Notions: Marker; tapestry needle

Gauge
18 sts and 24 rows = 4 in St st. Approx 23 sts and 24 rows = 4 in Coin Cable (unstretched). Check gauge on blocked swatch.

Sizes/Hat Measurements
Note: Coin Cable stitch pattern looks best when not overstretched; thus “stretched” measurements below represent not maximum diameter possible, but maximum diameter without distorting stitch pattern.
S: 16”/41 cm unstretched; up to 18.5”/47 cm stretched; approx 6.5”/17 cm deep
M: 19”/48 cm unstretched; up to 22”/56 cm stretched; approx 7.5”/19 cm deep
L: 22”/56 cm unstretched; up to 25.5”/65 cm stretched; approx 8.5”/22 cm deep
(Size S should generally fit small-med child; size M large child to med adult; size L large adult. Shown in Size M.)