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So it feels that it runs a little small. I will use this in our bowling league and decided to size "up" to an XL for comfort. Also note that the short sleeves have an elastic "cuff" on them to make them fit pretty snug
Does run small. I would normally where a large but went with the XL. I will say the cut is not flattering if you are curvy. Also the opening where the buttons are is small for an XL. Compared to name brands that are like this the buttons would be lower on the chest, which i think affects the fit.