get naked and twirl in circles
you can get it at the Festival of Flight. but the Festival of Flight is over, so you will have to wait until the next one, but if it's not coming back, you're out of luck.
Unlock it, find it in the April Fool Party, or find it in the Festival of Flight!
You Don't Use Hats. You Wear Them To Costimize Your Penguin.
The are hats with miniature propellers. These types of hats have been around form many years.