You could always make your own chain-mail out of wire, it won't be strong enough to stop a knife or arrow but it might just save you from an un-expected bite. Another is ring mail where rings are sewn to a garment of leather to stop slashing weapons and bites. The chain mail would be heavier but a helm of it can fall over your neck and prevent breaking the skin, ring mail would be lighter but the rings after a fight would need to either be replaced or sewn on again. Rubber would do alright as a saliva barrier but in hot climates the build up of heat would give you heat stroke. As for stopping bullets you can make your own bullet proof vest but to carry around replacement steel plates would be a pain. Oh gaiters for the ankles too, the ones used for brush cutting and snake proof, those should stop a bite. As to Kevlar, you might be able to find some but the price would be very steep. I will check some of my sites and see if I can find one and reply.
They make different kinds of these. I see a lot of fabric and nylon ones commercially available for hiking and stuff, but you need them at least made of canvas. The military ones like these are best, canvas (WWII era?) or leather, and taller types are available as horse riding/equestrian equipment.
You can make a lot of stuff in this archive with some basic materials from your local hobby retailer. Let me see if I can find a quick primer for leathercraft, if not I will post some quicklists for basic leather working tools.