Why does Mickey wear Organization coat?

Why does Mickey wear Organization coat? The Organization coats are made so that they protect the wearer when traveling through the Dark Corridors. Since Mickey uses them as much as any Organization member, I’m sure, he has to wear it, otherwise I would think he’d be overcome by darkness. Pretty much this.

The Organization coats are made so that they protect the wearer when traveling through the Dark Corridors. Since Mickey uses them as much as any Organization member, I’m sure, he has to wear it, otherwise I would think he’d be overcome by darkness. Pretty much this.