This is a charted pattern for a Fair Isle style cap/kep/hat.
I chose 2 dark colors and 3 light colors for the design.
Specifically these yarns:
Knit Picks Palette (fingering weight 100% wool yarn)
MC1 - Merlot Heather 75 yds
MC2 - Asphalt Heather 30 yds
CC1 - Marble Heather 30 yds
CC2 - Coriander Heather 15 yds
CC3 - Suede 24 yds

If you are substituting yarn, consider using dark for the main colors and light for the contrasting colors.

Consider blocking your hat with a balloon to give it the round shape. Blow up the balloon about 1 inch less than the head size you are making it for.