I'm 5'10 190 lbs. and the medium men's fit well.  Thankfully I don't have a gut but I am broad shouldered/ chest.  It is snug but looks good. It zips up from the behind bottom up the middle. Overall I am impressed with the look. Even stitching, smooth fabric. The pip pins are metal and look great.  The com badge is plastic (which is what is used on the shows)but looks ok. I purchased a metal DS9/ Voyager one instead.

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