I was hesitant about this one since i've tried cloth & stone shirts in-store and found them to be tight in the shoulders and arms. i have athletic shoulders and arms, so i didn't have high hopes for this one. i tried it on in-store and it's surprisingly true to size. i always wear m in tops and this fits perfectly. it is long, but i like that there's enough length that i can tuck it in. for reference i'm 5'3", 130 lbs, a cup, 17" across the shoulders.