I realize this might or might not be your style. But at least consider it. Get breathable cotton, with 15 or more pockets. It becomes a walking, incognito extra carry-on. On one occasion recently, a cultural “insider” had said he could only take 2 people with him into a Muslim area. I volunteered to stay back and let two others go, but he insisted that I could too, in addition to the other 2 visitors, because he said, as he threw a glance at my vest, “He’ll look like a professional journalist anyway.” My camera fits in one pocket, while in others, I can insert a lightweight mini-tripod, a small flashlight, hand sanitizer, passport (in a protected, waterproof pocket), some artificial tears, and everything else you like to carry along. You should be able to find these online for $50, and in a large camera specialty store for $70. Obviously, the advantage of the latter is that you can try them on. Stick to khaki. The black vests seem a bit too paramilitary for my tastes.