This season is must have accessory - Balaclava hat transformer.
You can wear it as balaclava or fold to regular hat.

Sizes
toddler, small child, big child/small adult, adult, big adult
To fit head circumference:
16-17.5, 17.5-19, 19-20.5, 20.5-22, 23 inches
40.5-44.5, 44.5-48.5, 48.5-52, 52-56, 58.5 cm.

Materials:
Bespoke DK by Clinton Hill cashmere: 1 (1, 2, 2, 2) balls
US Size 7 (4.5 mm) 16” (40cm) circular needles.