The number of stitches cast on for each size is identical, the needle size changes.

Measurements
Headband (slightly stretched) 18, 19, 20 in

Materials (all sizes)
Patons Fiona
Natural X 2 ox ball 1
Blue oddment
White oddment
Brown oddment
Yellow oddment
Green oddment
Red oddment
Charcoal oddment
Lovat oddment
Set of four needles with points at both ends.