White Coat

The White Coat, also called the White Cloak is Colin's signiture coat he wears throughout his adventure. Like the original black coats that Organisation XIII's Nobodies wear, it is a magical form of clothing that allows the person that wears it to safely pass to other worlds. However the white coat is more for passing through the Lanes Between without the need of Keyblade armour to protect themselves from the darkness in the Realm Between. Colin doesn't need a Keyblade Glider or a Gummi Ship since Radiant Garden is both his world hub and mode of transport as, by the power of Holy, giving him easy access to other worlds.

Colour of Light

 * KH article: Xemnas (Boss), Final Form

The white coat bares some resemblence to Xemnas O13 coat during his Final Form, but the white coat, as name sake, is white.