|Zombies wouldn't be effected by that, so they could just chomp down at full strength and grind and gnash their teeth to tear away at the leather.|
I thought about that. You have to remember that cats are hunters. Big cats are known to bite and kill large animals while running. Humans were also hunters at one point, but we didn't bite our prey. Incisors are just not designed to tear though flesh. If you try to bit something hard enough with all your strength, you'll just break your teeth off. Despite their name, incisors don't puncture; they cut. The distribution of force is on a line, rather than a point like a cat's teeth. Also, as a person gets older, the teeth erode and dull, becoming even less effective.
I'm not saying you won't feel the bite. Oh, it will hurt. But it don't think it'll get through.
|can zombies arm themselves?|
Clumsily. They retain habits of their past lives. Watch the original Dawn of the Dead
(1978) (which I'm told is a satire of consumerism, although you may miss it if it's not the first zombie movie you've seen) and you can see zombies strolling through a mall, pushing shopping carts.
Anyway, if you stand around long enough to let a zombie walk up to you and cut through your armor with a bolt cutter, you deserve to get eaten.
Day of the Dead
|AFAIK, no, I've never seen zombies (fast or slow, infected, etc) ever using weapons|
(1985), at around 1h 32m a zombie shoots and wounds a soldier. Later on, he (the zombie) salutes him.