Okay, So I know that items that mask your current equips are essential for PVP. ( Camo mounts, symbiotic equips, Livi Items ) BUT there are a ton of super great looking items that wont get much use after people rush through the low levels. So I'm suggesting a system- maybe a dungeon, maybe a quest, maybe even an orgine service- that allows you to take an item already in the game, and allows you to turn that appearance into a cosmetic only item. I think it shouldn't work in PVP, but I don't see why it couldn't if it took the form of feeding a livi item 1xxx the item you want so that it could "learn" the appearance.
But if it didn't work for pvp, then you could open up aesthetic only items to everyone. It could work the same way equipping a shield in PVE works.