In the latest big patch 3 new areas were added to the game:
1) Marjami Ravine
2) Yorcia Weald
3) Dho Gates
Monsters, Soul Pyres and Reives in these 3 zones have a chance to drop one of 22 Job Specific Capes.
The rate is pretty low and it was meant from the developers as a system to promote doing reives and various activities in the 3 new zones.
I think enough time has passed since then, and now most people just obtained what they needed or gave up trying to.
I hence propose a new system.
Similar to what was recently done for Abyssea Feet equipment, there should be an NPC that in exchange for any 3 Capes, gives you a chance to pick 1 cape of your choice.