Light weight pants? Pheasant hunting or grouse?
Pheasant hunting is typically easier walking, no thorns/brambles. Most corn fields are devoid of burrs et al. Grouse hunting is tougher going.
Several years we had 80 degree temps while pheasant hunting and I wished I had a pair of pants that stop at the knees. Cabala's sold a very light pant, but I believe they discontinued the one I have. A pair of cheap khakis will work!