It gets cold flying up in the air, that's why you need a costume accessory like the Lined Aviator Hat. When you're battling with (or against) the likes of master air criminal Jean Robur or dueling with the Red Baron or harvesting cavorite, you could use a good hat. As a great man once said, "Look the part, be the part."
Aviation is as much sartorial flair as it is aerial acumen. One can't simply fly a biplane against the bosche without the proper attire. Luckily (for you), there is the Lined Aviator Hat, which is guaranteed to improve your skills in the deadly ballet known as the dogfight.