A slouchy hat knit seamlessly in the round with windowpane corrugated ribbing stranded colorwork

Materials:
yarn:
Main Color (MC): 100-150 yds. worsted weight yarn 
Contrast Color (CC):  50-75 yds. worsted weight yarn 

needles:
Sz US 8 circular needle or size needed to knit the corrugated ribbing to gauge 
and a needle 4 sizes smaller (size US 3 or 4) circular needle 

Other materials: yarn needle 

Gauge: 
19 sts/4” in k1p2 ribbing
18 sts/4” corrugated ribbing (k1p2 with colorwork) 

Sizes:
Child small (16” head circumference), Child medium (18”), Women’s small/medium (20-21” head circumference), Women’s large (23”)