Headwear with visible 'ear flaps' dangling from them. 

Characteristic of [[ushanka]]s and [[aviator cap]]s when the hat flaps are left to droop, rather than being pinned up.

It also be [[hat]]s that normally <i>don't</i> have hat flaps, but has them incorporated into their design.

For hats that have a single flap on the back of the neck, see [[neck flap]].
hat flaps