I am 6'0 tall and weigh 160 lbs. and I bought a LARGE, which was a perfect fit in the sleeves, and the bottom went just below my firm and succulent butt cheeks.
Be aware that this jacket is really too heavy for backcountry hiking and skinning; so I would only use this at the resort. No insulation, but a ton of fabric, zippers, pockets...you get the idea. Also has wrist gaiters but they are bulky and would only go over bare hands or pipe gloves. Would not go under gloves.