I don't know why some reviewers are recommending going up a size. I have, and although I have a muscular build and always wear a medium or small, the medium fits very poorly - and has an odd fit. I weigh 160 pounds with a 42 inch chest and the average size is huge for me - more for a 48 inch chest. It's very wide and expands under the arms - I think you must have huge, flared armor to wear that.
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