Relaxed Fit Pure Cotton Garment Dyed Polo Shirt

I'm 5'10 and naturally a slim build. Since I've started lifting, my medium shirts don't fit very well anymore in the armpits and shoulders. I got a few large work shirts but they are annoyingly long. I bought a relaxed fit and it's great - right size shoulders and length. Unfortunately like the other reviewer, I went back and found the three available in the other colour I wanted were all a slightly different size and didn't fit as well. Would have been 5 stars.

At 5 foot 8 (and a half) I have difficulty finding t-shirts that fit well. No matter the size, small or medium, M&S t-shirts always seems to be designed for men 5 foot 10 and above because when I try one on it always hangs down so low it look like a dress. So I havent been able to buy an m&s t-shirt for years! However, I tried one of these on in the shop and it fitted perfectly, good length and nice loose fit, so i bought it. A week later I decided to buy 2 more of the same, just different colours. Unfortunately, i had the take these 2 additional t-shirts back because the fit was completely different, and there was even a difference in fit between these additional 2 as well. Tighter around the middle (not a loose fit), and much longer. The conclusion, the factories making these t-shirts are not consistent.