I'm 5'10" and 166 pounds. I ordered a size plus. It fits my chest well, requires no extra material, and at the same time doesn't fit me. There's a bit more excess around my waist. FYI I'm wearing Size 32 jeans The thw material on the shirt is lightweight and has an exceptionally soft feel The colors are beautiful I have the teal, royal blue and neon blue versions of this shirt and they are very bright and striking.