Option 1: Use the ornament system. Add an ornament slot to every legendary that allows you to choose from any armour currently on your character to change the look to that piece. OR Option 2: Add an extra button you can press on all items that says "Set As Armour Appearance" or something similar so we can use any item we have without needing it in our inventory. OR Option 3: Add an 11th slot to the inventory that you can send armour to to set it as your armour appearance. Let me know which one you guys like best!