Yarn:
Adult: air wool addicts by Langyarn (wool 84%, polyamide 16% ,50g 125m)
Child: DK yarn (merino wool 100%, 200m 100g)

Yarndage: Adult: 5balls (615m) child: 250g(500m)
Can vary by your desired length and hood adjustment

Needle
Adult/child
Body: 5.5mm/4.0mm circular needle
Rib: 4.5mm, 5.0mm/3.5mm circular needle

Gauge
Adult: Use 5.5mm circular needle
Pattern A(15 sts) 5cm Pattern B(6 sts) 3.5cm
26 rows for 10cm
Child: Use 4.0mm circular needle
Pattern A(15 sts) 3cm Pattern B(6 sts) 2.5cm
30 rows for 10cm

One size bottom-up style hood neck warmer
Unisex fashion for the hood you can adust the height with trying on add or delete multiple of 6 rows