To fit head sizes: small 48-51 cm, medium 53.5-56 cm, large 58.5-61 cm.
Brim circumference 24 (32, 40) cm blocked and un-stretched.
Length from base of brim to top centre of crown 20cm.
You will need approximately 105m (115m, 130m) of 10ply/worsted weight yarn.
NEEDLES & NOTIONS
4.5 mm 40cm circular needles and 4.5 mm needles for knitting smaller circumferences.