It is an easy pattern for an aviator hat with 6 sizes, so siblings can have matching hats!
Earflaps and aviator flap are knit flat on two needles. The rest of the hat is knit in the round.
The earflaps are button fastening under the chin to keep little heads from wriggling out of it, and tiny toddler hands from pulling it off after two seconds, but if you are knitting for an older child and want the earflaps to hang freely just make two of the left earflap and don’t add a button – simple!
There are plenty of pictures to guide you.