Well I've seen snakes bite people in the woods ...... and heard of even more instances. A couple of years ago a guy had to be air lifted from a BIG rattler bite. Not to mention how many times I have walked right past a cottonmouth or copperhead lying off the trail. I'll wear them until Thanksgiving. Better safe than sorry. As docile as copperheads are supposed to be,I had a buddy get bit by a copperhead a few years ago. He said the only way he could describe it was "somebody put his hand in a fire and he couldn't take it out."
Heck I had to persuade a cottonmouth to get off my trail yesterday.
Boots, chaps, doesn't matter, but in the south, I'd wear something.