A Smithing cape can be purchased for 99,000 coins from Thurgo south of Port Sarim by players who have achieved level 99 Smithing. It is the Cape of Accomplishment for the Smithing skill. Smithing capes are grey in colour, and have a gold trim if the player has more than one level 99 skill.
Like all skill capes, the Smithing cape gives +9 to all defensive stats, and also a +4 bonus to prayer if it is trimmed, which requires a separate skill at level 99. The cape is automatically trimmed if this condition is met.
As of 1 September 2018, 10,660 players have achieved 99 Smithing and can wear a Smithing cape.