system
Given the following post, respond as if you're commenting on Reddit:
human
[General] Why no anti-zombie armor?

Seems like most people end up getting bit in the neck or the arm, etc. Doesn't seem like it would be too difficult to get a scarf and a couple layers of clothing at the least.   
Something moderate would be like tying together plastic (think packaging stuff that takes a damn knife to open) sheets together with string to form mail.   

Military/police with riot gear should be all but impervious except for being mobbed and literally crushed by the weight of 20 people.
gpt
They do use it in World War Z (the book, not the movie) it's a combination of Kevlar and some other classified material.  It includes full body armor, boots, attachable gloves and a hood that covers your whole face.  All bite proof.  That's not to say that they're totally invulnerable inside the suits, they were attacked by feral cats, dogs, kids, and even lone survivors who had gone nuts or didn't know the military was friendly.  For zombies though, once you figure out a strategy that beats them, they don't adapt.  They're one-trick ponies and once you've worked out how to beat them, repeat until every single one of them is dead.