Not realizing that Isabelle hadn't explained the significance of the color, Magnus blinked in mild surprise. Then again, he realized, it would be something she just did and didn't think about or explain. She looked fabulous enough in everything that he doubted Billy would have noticed.

"Shadowhunter thing. Black for hunting through the night, for death and mourning, the color's white," he explained, in that singsong way of someone reciting a poem, not really speaking.