The design is unisex and timeless. Use any fingering weight yarn you love. Three 50 g balls of yarn should yield sufficient yarn to make two hats: simply switch the main color and accent color in the second hat.
The hat uses about 100 yds of the main color and a total of about 80 yds of two contrasting colors.

Knit it in the round on circulars and double-points, or use the magic loop method. You’ll be using a chart for the colorwork, but there are only two colors per round. Practice holding one color in each hand for extra-speedy knitting. Watch How to Work Stranded or Fair Isle Knitting for tips on this technique.