I was wondering about "a garb shall be our mark", and remembered that the Rangers of Arnor wore a silver star. They're also noted for being tall, and for standing guard over the Shire and surrounding communities. And they're rather more than most people take them for at first glance.
If the "quest" is more than just a synonym for 'task', it could point specifically at the Grey Company. Did they have that name because they wore grey? Apparently they did, so I think they work really well.
hS
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