I mentioned in the previous post on survival shorts that sometimes there is a benefit to blending in with the crowd. Unless you're facing an invading army, and probably even then, camouflage probably isn't the best option for get-out-of-town clothing.
Yes, there is such a thing as "Urban Camo". It's a digital camo in all shades of black and grey, it's supposed to break up your outline in an urban environment. I'm not sure how effective it is in military or law enforcement applications, but for the average person I think there's better options.
Or even better...
You could walk around and ask everyone for empty cans, bottles, change, and you'd still be invisible.