Arcana. Your expertise in working with leather grants you added insight when you inspect magic items crafted from leather, such as boots and some cloaks.
Investigation. You gain added insight when studying leather items or clues related to them, as you draw on your knowledge of leather to pick out details that others would overlook.
Identify Hides. When looking at a hide or a leather item, you can determine the source of the leather and any special techniques used to treat it. For example, you can spot the difference between leather crafted using dwarven methods and leather crafted using halfling methods.
Additional uses. You can use your leatherworker's tools to do a variety of things, as your DM if you may use the tools for a specific task. Examples of such tasks are as follows; Modify a leather item's appearance, determine the history of a leather item.