I don't know of an earflap hat that uses 2 straight needles, u may want to practice on something like this
to get started. BUT, I PROMISE you that once u experiment with knitting with circular needles (16 in. for hats) that u will love it
Amy has great videos on here about knitting in the round.
Meanwhile, u can look @ a bunch of hat patterns @ www.knittingpatterncentral.com
I will look around & let u know if I run across what u r looking for