oct will likely (not always)be warm during days but freezing at night. I PREFER LAYERS to a heavy coat and personally like woal coats. warm , comfortable boots,your likely gonna be covering some rough country and break them in before you go hunting(have seen so many over the years that just buy a pair and then hunt the next day and wind up with big blisters. that will ruin your fun quick.)
my best advice is get on the phone and talk to your outfitter and pick his brain as he will know best what you need.if you have a ? ask it . he is your employee and if a good one he will do his best to provide help.
what unit are you hunting? cow or bull?
good luck on your hunt. and if you have any specific ?s don't hesitate to ask.
oh, don't forget your camera . we needs the pics.