The stranded colourwork pattern of this hat is complemented by four-colour corrugated ribbing; the crown shaping is achieved using centered double decreases. This design, which comes in two sizes, uses small amounts of each shade of the yarn, so it is ideal for using up leftovers in your stash.
(Note: yardage estimate above is based on length of the six skeins called for)

Size

To fit head circumference:
52 (57)cm/ 20.5 - 22.5 inches

Actual head circumference:
50 (55)cm/ 19.75 - 21.75 inches

Diameter after blocking:
26 (27)cm/ 10.25 (10.75)in

Cast-on edge to top of crown:
21 (22.5)cm/ 8.25 (8.75)in

Additional tension info:
Size S only 28 sts and 32 rounds to 10cm over Chart patt using 3.25mm needles.
Size M only 32 sts and 34 rounds to 10cm over Chart patt using 3mm needles.
Both sizes 24 sts and 48 rounds to 10cm over corrugated ribbing using 3mm needles.

Yarn
Jamieson & Smith 2 Ply Jumper Weight
(4ply weight/ fingering; 100% Shetland wool;
115m/ 125yds per 25g ball)
1 x 25g ball of each:
A Shade 134 (aubergine)
B Shade 131 (purple blue)
C Shade 132 (bright turquoise)
D Shade FC11 (lime)
E Shade FC34 (light turquoise)
F Shade 21 (navy blue)

Needles & accessories
1 set 3mm (UK11/US2-3) double-pointed needles
Stitch markers

Size S only
1 set 3.25mm (UK10/US3) double-pointed needles
3.25mm (UK10/US3) circular needles, 40cm long

Size M only
3mm (UK11/US2-3) circular needles, 40cm long