post #16 of 16
I too am facing this problem.

My sizing is ALL over the place as I'm an athletic running back build.

I wear 15.5/M slim dress shirts and don't know whether to go with small or medium. Small would probably be form fitting but I figure it'd be comfortable with the material.....OTOH, medium is perhaps a safer choice, but I'm afraid that the undershirts will fit baggy and that the looseness will be uncomfortable.

Question: Why does length matter so much for undershirts? I'm seeing recommendations to get long ones. Why does it matter if it's under an actual shirt?