Primeval Skin?
I still have the box unopened sitting in the bank. I was originally planning on making it for an ascended Knight’s set but there has been a change of plans …
You can either leave the 6 skins as-is and throw them in the bank or something, or you can right click and use the “move to vault” option to delete the skin items from your inventory and unlock the appearances in the wardrobe.
If you do the former, you’re obviously taking up 6 slots in your inventory or bank until you decide to use them. If you do the latter, you clear inventory, but you also lose out on the “free” transmutation that comes along with skins and will need to use a Transmutation Charge when you finally decide to transmute the appearance onto an item.
Personally, I’m keeping most of the skins I have any plan on using any time in the future as skins, because I want to take advantage of the free transmute. But if you really need the space, then its an option I suppose.