Certain Church hunters obfuscate their identities and slip into the nooks and crannies of the city. This is the garb that allows these harrowed individuals to go unnoticed.
These hunters are keen to early signs of the scourge, serving as a first line of defense against its outbreak. Or perhaps, when the time is ripe, they find signs of the scourge where there are none. It just goes to show, the corner beggar is not always who he seems.