The socks on the photo are knit in a Size M, shoe size 37 (6US).
Foot length is adjustable

I used my own handdyed yarn: Fingering weight 4 ply sock yarn, 75% wool -25% nylon 100gram =420m

With this quantily you have more than enough to make Size L
Black 75 gram, Purple 20 gram, White 20 gram, Orange 20 gram, Green 10 gram

Size M 21- 23,5cm (foot circumference)
Size L 23,5 – 26,5cm (foot circumference)

DPN’S or Circular needle 2.5mm (US 1.5), 80 cm (32 inch) for magic loop. For Colorwork 3 mm (US 2.5) needle. I recommend a 23 cm (9 inch) circular needle for the colorwork.