With one exception, the Action Jacket for iPod nano follows past DLO Action Jacket traditions: it starts with a vulcanized neoprene case that has a clear plastic face, and comes with an integrated, non-detachable belt clip which slips into a loop on a color-matched elastic and Velcro armband. This armband is an inch shorter than Apple’s Armband and equally wide—narrower than the Marware armband that comes with its $30 Sportsuit Convertible.…