Okay, I already posted this thread on my own board, but I'm such a kind little SOB I'm reposting it here for a larger population.
----------------------------------------------------------------
Okay, first off, here's a site with all the gorey details of getting your AF armors. After thoroughly studying everyones AF that are currently translated, here's a little synopsis of how they work.
AF1- Weapon AF Quest: The first AF quest is always the AF weapon, available to start at 40, though some are a bit too hard then, like BLM AF1. The person that starts your AF1 will also start AF2 and AF3 for you. (Unless one of the untranslated ones breaks this rules.)
AF2 and AF3: As stated before, these are started by the same person as you took AF1 from. They items aren't always the same per class this time, but generally are gonna be your headgear, leggings, or feet quests.
AF4- Your Armlets: This quest is a bit different, no matter what class it is started by Galsum in the Upper Jeuno armory shop. It always works the same though, you have to go find the Old Armlets in the coffer of your class, bring it to him and show him, then go to Port and check the ??? on the box outside the Duty Free Shop. This spawns a scene, then you are sent to Castle Vhazl Baileys to fight an NM Demon for the 'Flame of Darkness'. Bring it back to get your AF armlets.
Coffer AF equipment: Each class has an additional two AF pieces hiding in Treasure Coffers in the world. Find out where they are and work for the key, then go raid them for your goodies once you got the area's Coffer key.
Requirements for these quests: Okay, AF1 needs lvl 40 as stated, the rest need lvl 50 in said job or higher. For the Coffer AF's you need to at least of started AF4, which does not require completion of 2-3, only 1. You don't even need to have completed AF4, just started it (Galsum gives you info on the coffers) and you can go raid for the other coffers for the 2 easiest AF pieces generally. (Unless you're a thief, than AF1 is the easiest :P)