gauge:
Mittens: 27 sts and 48 rows = 4” / 10 cm over chart pattern
Hat: 21 sts and 38 rows = 4” / 10 cm over chart pattern
Cowl: 21 sts and 42 rows = 4” / 10 cm over chart pattern

suggested yarn for all three items:
Blue Sky Fibers Woolstok (123 yd / 112 m per 1 ¾ oz / 50 g skein; 100% Fine Highland Wool):
4 skeins in #1304 Grey Harbor (MC)
3 skeins in #1317 Midnight Sea (CC)

1 skein each of MC and CC will make the Mittens or Hat.
2 skeins of MC and 1 skein of CC will make the Cowl.