Not sure about everyone else but I'm 160lbs 5ft 8in and in good shape. I wear a size medium in almost everything that is considered form fitting. But when I washed this shirt cold and tumble dried it came out of the dryer looking like it would fit my 6 year old son If you go one size up ordering, I have a feeling the overall shape of the shirt will taper off on the arms and body, although I'm not sure.
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