Many bikers wear leather.
It provides some protection if they they fall off their bike, true, but so would any other thick material. But nothing is as tough AND slippery as leather. It resists tearing. When a biker meets the road unintentionally, he wants his clothing to slide, not shred.
That leather will be just as slippery to the hands and teeth of zombies. Depending on climate it may not be practical to “leather up” at all times. But, when you know melee combat is imminent, it provides both flexibility and defense and better yet, it’s common.
Leather up, kiddies!
Source: Internet Verified by bradzb, longtime biker.