At some point, someone will have to leave the safety of their defensive position, and go out among "them". Proper planning, equipment, and tactics can go a long way towards prevention of being bitten, but practically speaking, it's not a matter of IF you're going to get bit, so much as WHEN...
Short of a suit of chain mail (heavy, hot, and almost impossible to find), what can be done to protect against being bitten?
Prior to Z-day, I was an avid motorcyclist...sportbike scum, in fact. Survival on two wheels also requires some protective gear...(if you'll note my profile pic, that green jacket is not just a fashion statement). The same leathers that protect my hide (in the event I find myself sliding along the asphalt at 80 mph with 400 lbs of bike acting like some giant, horrific cheese grater) is also excellent protection against a voracious zombie's choppers. Add leather pants, boots, gloves and a helmet, and you're armored up as well as can be expected.
Be advised - not all leather garments offer the same level of protection - the thinner leather vests or chaps may not stop a determined ghoul (and what zombie ISN'T determined?) from getting through to your tender skin. Also - remember at all times that there will still be vulnerable areas, where two garments come together (neck, waist, wrists & ankles).
In colder climes, this ensemble makes perfect sense, but in the warmer regions (like here in Florida), such an outfit could be considered far too hot... all I can say to that is, in the sportbike community there's a saying; "It's always better to sweat than it is to bleed".