Slouch hat

A slouch hat is a type of wide brimmed bicorn/tricorn, usually made of felt or cloth. The slouch hat has been used by many militaries and police forces, but is most famously used by the Australian military, or ANZAC. They are commonly depicted with one side being bent, the reason being it allows the user to more easily access a rifle equipped with a bayonet without damaging the hat.

P1: Why is that guy wearing a slouch hat?
P2: He's probably military, or it's because the sun's out.