Hey all Have a sizing question for you. I ordered this in a Med. I'm 5'8, 160 lbs, 40' chest, athletic build. I like the length of the jacket, length of the sleeves, and pretty much how it fits. However, the jacket gets very tight under my arms and into my armpits. Trying to decide if I should exchange the medium for a Large, or if this jacket will not fit me. Any thoughts? How much longer will the sleeves and jacket be in the large vs. the medium. Any and all help is appreciated. Thanks!