Because all the members are Nobodies, they lack hearts, meaning they also have no emotions. The Organization yearns to discover the secrets of the heart and fill the empty void inside themselves by gathering hearts to form Kingdom Hearts so they can become full beings again. Each member is aware of their lack of emotions, and many of them pretend to have emotions, for example, Saïx's enraged battle style and Larxene's giggling and winking. The Kingdom Hearts: Chain of Memories manga and several other media forms provide an alternative view, saying that they do have emotions, but are plagued by a feeling of uncertainty and emptiness due to not having hearts....
Each member in the Organization dons the same uniform, regardless of whether they are male or female. The uniform consists of a single black leather hooded coat. It is plainly adorned with a silver zipper and seemingly pointless silver beaded pull strings for the hood that form a semi-circle in the middle. Each member wears their zippers at differing points.
Not much is known about the under garments of the Organization. It is known, however, that they all wear hakama-esque black pants and knee high silver trimmed boots, with the exceptions of Roxas, who wears sneakers of the same color, and Larxene and Xion, who wear a more feminized version of the boots with heels. In addition to this, they all wear black leather gloves of some unknown length, as they disappear under bell shaped sleeves. Some members have different looking coats, for example Axel, whose sleeves are tight around his wrists. Upon closer inspection, it can be seen that the hems of each cloak are each slightly different, as well as the shoulder pads (such as those of Demyx and Xigbar, which seem to be slightly pointed)." -Kingdom Hearts Wiki
| Organization XIII (click for bigger) |