A great uniform that would not standout in urban or suburban environments would be the 5.11 Tactical Pants. These come in nine different colors: charcoal, black, grey, khaki, coyote brown, olive drab green, tundra (?), fire navy, sage and walnut. You are going to have to visit their site (link to the left) or at the bottom of this post, in order to see the colors. Wearing a common color of 5.11 pants would help attain what you may be looking for in a common survival group uniform item. Shown below are the Black 5.11 Tactical pants, faded from repeated washings.
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