I don't even know the name of the hat. I'm just going to let you examine the pictures and see what I'm talking about cuz it's EVERYWHERE. If there's a mandolin or a banjo in any band's song, there's also a 99% chance SOMEONE is wearing this hat.
The Avett Brothers
The Lumineers
Of Monsters and Men
Mumford & Sons
The Head and the Heart
Old Crow Medicine Show
The list goes on but you get the point. Who is responsible for this??