I stumbled on some fine lightweight cotton pants. The discontinued Woolrich tactical elite pants. If you can find them online, they should be cheap since they were discontinued. I have them in a coyote brown color. They are ripstop cotton, very light, very baggy, and plenty long. I like all of the pockets they have. These are my favorite for still hunting unless I am dealing with briars (then I want Carhartts).
For treestand hunting, I prefer the zip off fishing pants. I climb in my stand and take the legs off. I cannot believe how much cooler I feel basking in the smoke from my Thermacell in shorts.