Robe of the Fire-Rat

While the Fire Rat's origins remain unknown, it is presumed that Inuyasha's father had made cloth from Fire Rat fur, which was used to create a robe. It was revealed in the third movie that Inu no Taishou had it with him before giving it to Izayoi for protection. After her death, the Robe of the Fire Rat was inherited by Inuyasha. Along with the container of rouge that his mother used, the Robe is the only thing that he has that was her's. Its distinctive red color has become his defining signature look.

The Robe of the Fire Rat was created from the fur of a yokai animal, and has some yokai abilities:
 * The Robe is completely fire-proof. When a wearer is sufficiently covered, they are protected from both heat and flame. Afterwards, the Robe shows no sign of being burned or even singeing.
 * Acts as armor, being able to deflect regular swords powered by human strength. A yokai weapon can cut it, however.
 * As it was derived from a yokai, the Robe's powers can be affected by anti-yokai barriers. Just as when Inuyasha became human inside the barrier of Mount Hakurei, he discovered that the Robe had also lost its armor quality, acting as normal cloth.
 * The Robe is able to mend itself, therefore it doesn't need to be mended after battles.

Otherwise, it acts like normal cloth:
 * The Robe will become wet when exposed to water, and needs time to dry out.
 * As it is a flexible cloth, the Robe will not protect the user from serious blunt-force trauma.