I am 5'6" and 166 lbs. I ordered a large one. It fits my chest well, does not require any additional material, but it does not fit. There is a little more overhang at the waist. As a note: I wear jeans in size 32. The material of the shirt is light and feels exceptionally soft. The colors are beautiful. I have the teal, royal blue, and neon blue versions of this shirt and they are very bright and eye-catching.
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