If you have NIghtingale Armor but aren't wearing it, and you encounter a Thief in the wilderness, the Thief will not recognize you as a Guild member or a Nightingale, but you should get the dialogue option: "I would think you'd have more respect for a Nightingale." At which point he/she will leave you alone.
If you're wearing the Nightingale Armor the Thief should recognize you as a Nightingale and will give you 500 gold and then be on his way.
Here's the thing; I finished the entire Nightingale Arc and, while wearing the armor, Thieves don't recongnize me as Nightingale nor do I have the dialogue option.
Any ideas why not and how to fix it?