Currently costume stones are required to be compounded on your cosmetic maximize the potential of builds, but different builds require wildly different costume stones.
This results in the situation where if you want to play multiple classes, you're forced to menu through NPCs and pay a discard/recard fee each time, or get multiple sets of the same cosmetic which isn't feasible for some rarer cosmetics (ie Himmelmez's Sword).
Neither of these options feel ideal.
Because of this I want to suggest a costume stone loadout system, let's say you have loadouts 1-10 you can save at an npc.
Each loadout can be filled with costume stones of your choice, for example:
* Loadout 1 could be filled with Arch mage & warlock costume stones to maximize Arch Mage DPS
* Loadout 2 could be filled with attack speed stones to maximize event DPS
* Loadout 3 could be filled with another set of stones, maybe you want to maximize Cardinal, a Tank, Windhawk or any other job.
This would let people quickly swap between costume stone loadouts while letting them keep their favourite cosmetics.