Black coat

The Black Coat (sometimes called an Organization coat, or incorrectly as a black cloak) is a common form of attire for many characters in Kingdom Hearts. It protects the wearer from the darkness in various ways, and in some cases, from detection methods available to those who wield darkness.

It is assumed that this coat is worn by those who regularly travel through the Corridors of Darkness. It appears that the black coat is granted to those who travel through the Corridors of Darkness as a symbol of their ability to resist the potential corruption in doing so.

Somehow, when Riku and King Mickey cast their cloaks off, the black gloves, pants, and boots worn under the cloak disappear. Furthermore, any trace of the wearer's clothing under the coat disappears, such as Riku's collar, jeans, and sneakers in his second attire, or Mickey's trademark white gloves. All these hint that donning the coat transforms whatever clothing the coat's bearer is wearing under it into the black gloves, pants, and boots seen on all the coat's wearers.

It also seems to provide insulation, as Riku (and possibly Xigbar) were able to travel on the mountain in the Land of Dragons, seemingly unfazed by the cold and snow. But Sora, Goofy, Donald, and Mulan were also able to. This can be explained, however. Sora's magical clothes probably blocked the cold. Goofy had fur, and Donald had feathers. Mulan is probably just used to the weather.



Organization XIII
A common misconception about this coat (besides its being frequently called a cloak) is that all its wearers are members of Organization XIII. It is true that all Organization XIII members wear these coats, though. The form differs for each member; each member wears the main zipper at a different height, and some members' coats are thinner in certain areas. For instance, Axel wears his coat very tight against his arms while Xigbar's zipper is unzipped at a higher level the other members' coats. Additionally, Vexen's coat extends all the way that it covers his feet like a gown, compared to the rest. Demyx has a stylized shoulder gauntlet formation on his coat, making his appear more like a rocker's outfit. Roxas wears what appear to be black sneakers, while Larxene and Xion wear heeled boots.

Other wearers
The first person to wear this coat outside of Organization XIII was Riku. He is first seen in this coat fighting with Roxas in the "Deep Dive" movie. Along with this coat, Riku wore a blindfold across his eyes. Riku was given his Black Coat by DiZ so that he would not be tracked down by Organization XIII.

The King was another person who wore this coat. He was seen in a version of "Deep Dive" in it, and he was even seen in Sora's Awakening scene with the same coat, while he was coming to Sora and company's aid. What's interesting about his coat is that it is much smaller since it's catered to his body. Even the hood is sewn just for Mickey, with places for his ears. When Goofy is injured after the fight with Demyx, Mickey removes and discards his coat and charges into the Great Maw.

In Kingdom Hearts coded, a mysterious figure is seen in the black coat. In the fourth episode, it is revealed in Jiminy's Journal that this figure took on the form of Riku in his coat while helping Sora.

In Kingdom Hearts 358/2 Days, Moogles also wear the black coat, as a sign of their synthesis and shop services for Organization XIII.