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The top runs about 3 sizes smaller. I wanted a lot of room, so I order an X-large. Unfortunately, the size is about a woman's small. I figured at this cheap price point the top would be of poor quality (thin) and would run smaller. Don't buy or at least order 3 sizes larger.
I was pleased with how this fit. I am 5'11" 140 lbs and the XL was long enough in the body and also in the sleeves. However, the fabric had multiple defects in the front-- tiny holes that seemed to become increasingly larger after wearing it only a few hours. Sending it back. Hopefully the next one will be of higher quality.