Reddit mentions of Next Level Mens Premium Fitted CVC Crew Tee (N6210) White l

These are the best T shirts I've found for tall and/or athletic men. I'm 6'4" 180lb and the Large fits perfectly. The shoulder seams line up with the edge of my shoulders, the sleeves & body are slim without being too tight and the overall length is mid fly.

That said I think a large would also fit someone who is my height and an athletic 20lbs heavier than me. The shirt would be tighter, but in a flattering way.

They are thin (which I prefer) but for less than $10 each they are an incredibly good value. They also make a cotton/poly blend in the same cut.

Measurements for Large:

• Body Length = 30"
  
• Chest (1" below arm) = 22"
  
  EDIT: Forgot to mention that the white poly blend version I ordered (supplied by Under Moments) was unfortunately not the same as the colored ones. It was shorter in body length and had huge billowing sleeves. Just ordered a white 100% cotton one (the version this thread links to) in hopes that it fits properly.
  

Given Uniqlo a try? Of all the T shirts I've owned they've by far held up the best. There's also been a few posts about the Next Level shirts, which may be worth a shot for ~$7 but I haven't personally tried them.