Sweet idea to keep your ears warm and still wear a ball cap :0)
Football Beanie Hat, Crochet, Boy, Male, Female, Seahawks, Broncos, Griz, Bob Cats, Cardinals, Patriots, Green Bay, Cowboys, Fall Fashion by JillyBeaniesBoutique on Etsy https://www.etsy.com/listing/219150478/football-beanie-hat-crochet-boy-male
1898 hat variation, will also work well as a simple ear warmer.
Minecraft Creeper hat knitting chart - free. For Connor.
free crochet hat pattern with ear flaps for men | CROCHETED HAT WITH EAR FLAP PATTERNS | FREE PATTERNS by Saddiejean
Scarf Hat Duo: free pattern
I'm pretty sure I need to make us some of these hats!