A circle-shaped piece of plain fabric is knitted and then used to cover the button, which is then attached to the top of the crown.

Measurements
To fit Girl, Lady
Width around head
49, 53 cms
(19½, 21 ins)

Each pamphlet has a different set of recommended yarns. The following is from the Jarol version.

Materials
JAROL Aran Knittings
Jatok 2, 2 balls
Ballyfoine 2, 2 balls
Aran 48 2, 2 balls
Cable needle
2cm (3/4 inch) button.