The Porthallow Hat was designed to be knitter friendly, with only two colours per row and no floats of more than three stitches.
It is a companion to the Porthallow Cowl,
https://www.ravelry.com/patterns/library/porthallow-cowl

Yarn
x4 different colours of DK weight yarn.
Approximately;
Main Colour 50g / 117m (1.7oz /127 yards)
Contrast A 20g / 45m (0.7 / 50 yards)
Contrast B 10g / 23m (0.3oz / 25 yards)
Contrast C 6g / 14m (0.2 / 15 yards)

Sample uses Devonia DK weight by John Arbon - 100g (3.52oz) = 233m (254 yards)
Main Colour - Wood Smoke
Contrast A - Cinder Glow
Contrast B - Devonia Cream
Contrast C - Pollen Gold

Gauge - Blocked and unstretched
22.5 stitches and 26.5 rows = 10cm (4”)
in colour work.

Size - Blocked and unstretched
Circumference
Small - 44.5cm (17.5”)
Medium - 50cm (19.5”)
Large - 55.5cm (22”)

Height 23cm (9”)

To fit a head size of
Small - 47cm to 52cm (18.5” to 20.5”)
Medium - 52cm to 57cm (20.5” to 22.5”)
Large - 57cm to 62cm (22.5” to 24.5”)

Needles - Suggested size
3.5mm (US 4) 40cm (16”) Circular needle for ribbing.
4mm (US 6) 40cm (16”) Circular needle for body of hat.
Your preferred method for working small circumference, for the crown (DPNs or long circular for magic loop) in the same gauge as for the body.

Notions
Stitch marker
Yarn needle.