He is legendary in this house; his steps are stealthy and quick. You'd think that you'd hear him when he pulls up in the driveway, but his vehicle has a degree of silence and stealth that many secret agents would envy.
The brown suit is just a disguise, and we know it; what better way to disguise a ninja than as a UPS deliveryman? After all, they are friendly and harmless! How much can one fear a man whose job requires him to drive an enormous truck with no doors, while wearing the drabbest shorts known to man?Not to mention the socks pulled up, unfashionably, to his knees!
In your world, UPS men are pasty-skinned men in bad socks and orthopedic shoes, men who look down from their wind-tunnel truck cabs and wave at children in nearby cars. They are the harmless purveyors of heavy packaging. (Hey, Clark Kent was a reporter, and that seems an obvious little gambit to us now.)
In my world, it's a little bit different.