The New Official Wolf vs. Goat Thread - Page 490
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Hey man, I'm 6'4" and 185, most likely same build as you -- athletic and lean, not stacked. I got a L in BD, everything fits perfect, but the shoulders a just a smidge too big -- I guess it gives me incentive to bulk up a bit. I do have a smaller torso than most 6'4" guys; I'm really all leg -- so the 28" length is perfect on me. If you don't have broad shoulders I would go with the M if you can manage, because I think the shoulders will be too big (I'm like 18.5 shoulder to shoulder, so I'm just shy of what the L measurement lists).
But I'm also fairly certain you can return shirts -- so maybe get both and return the one that doesn't fit as well. Better to try on both and know for sure. But unless you have some crazy measurements, I think a M would work. You'll spend $10 more on returning, but at least you'll know you have the correct size.
Hope this helps.