I had a thought on the way armor might work. I remember reading that Weapons will effect "Outward Appearance". Then i remember reading "There are no jobs, just classes. So whats the difference? Well it seems to me a "Job" is something that cannot be altered. For example A Paladin in FFXI was a tank, nothing more. you gain abilities that cannot be altered in any way. Defender, shield bash... etc. Now you can try to alter your gear and be a DD,but you werent going to get to many parties shouting Paladin DD. Paladin might not exist in FFXIV. There is however a warrior class, which in turn you can perhaps equip with White magic to create a Paladin style class. And on the flip side equip with BLM to create a Dark Knight.
Now getting to my main theory on Armor. How many times in FFXI could you not tell what job someone was just by looking at them. I had a whole party once in the dunes wearing brass armor all looking the same. What if equipping a Certain weapon changed the look of that brass armor.For example you equip a bow, and your brass armor now takes on the looks of a Rangers outfit. Maybe Green cloak with brass metal clips, and brass leggings. Change to HTH weapon and now your brass armor looks like armor with cotton padding. Something protective, yet flexible enough to be agile. Sword would be straight Brass armor as we all know it. This would allow quite a bit of diversity,no more look-alikes and would distinguish the different role you decide to play. Let me know what you think of this theory along with some ideas or theories of your own