The pattern is written step by step along with detailed chart.
The pattern includes photo tutorial for the stitches and also video link of the stitch tutorial.

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Notions:
Knitting Needles: Size 3mm and 3.5mm, Wire length at least 40” (100 cm) for magic loop, or double pointed needle as preferred. Substitute size as necessary to obtain gauge and Tapestry needle for finishing up. A marker to mark the beginning of the round (optional)

Yarn Information: Yarn used is DK weight, super wash merino wool with 20% nylon. Yarn is my hand dyed.
Small – approx. 90gms (189m) Color A: approx. 80gms (168m)/Color B: approx. 10gms (21m)
Medium– approx. 100gms (210m) Color A: approx. 88gms (185m)/Color B: approx. 12gms (25m)
Large– approx. 120gms (252m) Color A: approx. 106gms (223m)/Color B: approx. 14gms (29m)

Gauge:
3.5mm needle – 6 sts & 8 rows = 1” in stockinette stitch
3mm needle – 6.5 sts & 9 rows = 1” in stockinette stitch

Finished Measurements:
Small: 35cm brim circumference (unstretched)/ 22cm in depth (unstretched)
Medium: 38cm brim circumference (unstretched)/ 22cm in depth (unstretched)
Large: 41cm brim circumference (unstretched)/ 22cm in depth (unstretched)

Errata : The body is knitted using 3.5mm needle and not 4mm needle