lirael coat and whistle

"Third Assistant's yellow, Second Assistant's red, First Assistant's blue, Deputy is white, and the chief wears black," explained Imshi, as she helped Lirael put on a brand-new yellow waistcoat over her working clothes. "Heavier than it looks, isn't it? That's because it's actually canvas, covered in silk. Much tougher that way. Now, this whistle clips on the lapel loops here, so you can bend your head and blow into it, even if something's holding your arms. [...]"

Lirael, Ch. 6, pg. 53