Wool and wool/synthetic blend dress pants from a thrift store might be worth a look and a try out. They are quiet, thin, lightweight fabric that sheds light rain and dew and are cut roomy for ease of movement, easy to lift a leg high to step over a log, etc. If you tear them badly, toss them. I have two pair currently rotating with one drying from hand washing out the blood and the other in service today. $4 to $8 is a common price. I avoid heavy wool and look for thin dress pant material. We can use them HARD, get them bloody etc. without any care or caution about tearing or staining expensive pants.
I have some higher end pants but in most Fall and even some winter conditions prefer the light wool. I have mentioned this before in the backpacking forum and cheerfully accept that this may be considered weird or cheap. Nah, light wool dress pants are merely functional.
