The small fits much better!
I love the style and quality of the leather. Initially I purchased a size medium based on the measurement guide provided. I am 5'6" and weigh 133-134 lbs. The medium was too big and the sleeves way too long. I called and ordered a small, which was sent out immediately. It fits great and I am a happy customer. The medium, I sent back and have already received notice of a refund.