There was a recent interview that detailed some of this system. It was google translated I remember so it was rough to read, however it worked something like this:
You need to go to crafters for crystals, these crystals would be set to ilevels of equipment similar to dark matter, (all equipment level 10 and below, 20, below, etc) You "copy" the image of the armor to the crystal and put the armor away. You can then use the crystal for the graphic.
Now how will this work from there they didn't say. Here is my specculation:
* It might be that you have outer slots and you keep these crystals in those slots, saving on inventory space and keeping your look the same no matter what you actually equip
* You "use" the crystal and it evaporates, but changes the look of the given armor piece you are wearing. Meaning you need to re-copy a new crystal for new armor.
I'll see if I can find that interview link and post it.
Edit: I found a posting of it with a better translation:
http://www.reddit.com/r/ffxiv/commen...naoki_yoshida/