Ditto on the warm weather in September. I've rarely worn anything other than cotton camo pants and long sleeve poly camo shirt, with camo fleece vest in the mornings. I wear thin, stretchy camo gloves, just for the concealment of the hands. One year though it rained for 9 days straight. Full rain gear all day.
My primary input is the importance of a good, higher (not ankle high), well broken in pair of Gore Tex equipped boots with good tread.
I wear a camo waterproof boonie hat, but headgear preference is very personal.