Very accurate on the sizing and as far as wool, not any better out there. I have a double mackinaw cruiser that is 27 years old and it has seen a lot and still in great shape, it has been sewed a few times, but that is due to me and my bunny huntin'. Guys who know me will tell ya how I hunt rabbits and what I go thru. I wear out a pair of heavyweight cordera brush pants in one season, I know guys who have the same brush pants for ten years, not if ya want to hunt with me. Buy the vest, great investment. Shawn