Timber, we hunted the Fortymile herd northeast of Fairbanks. Pants and coat are Sitka 90%.
On a side note about gear for hunting in Alaska, I have hunted up there twice in the last 3 years, both times with locals, once for moose, once for caribou. I found that local, longtime AK folks don't seem to be as hung up on gear as many of us in the 48 seem to be. They get it done with what they have. The exception being quality tents and quality rain gear. Make sure you have what you need to be safe in all weather conditions and don't sweat the details.
I understand the plan to donate the meat, but if you can swing it, bring it home. I froze the boned meat and brought it back on Alaska Airlines in 3 medium sized cooler for about $75. It was no hassle and well worth it. I made spaghetti sauce last evening with caribou burger. Relived the whole hunt in my mind as made my family supper.