Biography Armor Skin Obtainable After Deletion
It is rather easy to do if you have a spare character slot.
Create another character with the desired item.
Use a transmutation stone on the item you want with a useless item.
Then hop back onto the main character you want it on and use a second transmutation stone to get it onto the gear you want.
Probably didn’t explain it the best, but you can already do it following these steps. (It is how you can get Engineer stuff on a Ranger for example.)