I am 5"7 with 145 lb, slim / athletic build, 38" Chest, 31" waist The medium size fits me well on the chest, BUT RUNS TOO LARGE on my waist. Please note that this jacket is a "STRAIGHT CUT" jacket, meaning its chest size is the SAME as the waist size. The true size for medium size is measure to be about 40"41" on the chest, and so 40"41" on the waist. I bought this jacket as a outer coat, the overall fit is OK if i am wear a sweater inside. However, it will run too large if i am wearing it alone. Nevertheless, I like the style a lot. It is fairly durable, and warm. I highly recommend it.
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