Leather clothing and containers can also be mended using a heavy-duty needle and strong sinew thread.
The leatherwork command requires 10 levels of crafts.materials to learn, and is usually taught by other players or some guild NPCs. It can also be learnt from the tanner in the Triangle Market in Genua, or the Plaza of Broken Moons in Ankh-Morpork.
Each leatherworking attempt costs 35 crafts GP and requires the player to be in a tannery. Each leatherwork attempt costs some money, usually not much. This amount can vary between locations, and is influenced by the leatherworker's skills and the condition of the item / amount of improvement.
The player's bonus in crafts.materials.leatherworking determines their success and how much the condition of the item is improved. Attempting to leatherwork a severely damaged item with low skills may result in the item being destroyed.