Version 1.1:
[+] Now you can add as many skins as you want because of the pagination GUI system.
[+] Added new items to the skin_inventory.yml, nextButton, and previousButton items.
[+] The plugin now will put unique data to every skinned item, with this it's possible to revert back the custom model data to the model data before the item was skinned.
[+] Added new option removeSkinNoPermission, this option will remove an item's skin if the player/user doesn't have permission to use that skin. The skin will be changed to default under 3 checks (Item Pickup, Item Interact, Inventory Click).

Note: You don't need to reset the configuration for this update, the configuration will be updated automatically.

Version 1.2:
[+] Added physical skin feature, this feature is like a drag & drop on custom enchants plugin where you drag & drop the skin into the item, and the item will have the skin and also there is a skin remover where you can remove the skin from the item and turn it into a physical skin.

There are some new configs value, I suggest you to see the updated config here.