Guild Wars 2

So, I purchased this skin set today and upon doing so, it automatically unlocked the skin in my wardrobe across all types.

I am confused as to what I should do with the actual skins because all three are still in my bag. Is it okay to delete them and still have the skins unlocked, since I do not have to apply them manually anymore? I figured I would ask just to make sure.

They will let you transmute one single time for free without using a charge. If you delete them then you will have to spend a charge to put that skin on a helm.