I.E. Ralph Lauren Polo's will be a difference in the sizing in UK, US Asia etc. so a medium for the UK market will not be the same as a Medium in the US or Asia. Length - 26". Size - m medium. Pit to Pit - 21".
Wonderful LONG sleeved JUMPER from GANT. GANT Mens TOP JUMPER. Consider as well that the guy in the picture is 78 kilos/ 12.28 stones and is tall 180 cm / 5.9 feet he wear a MEDIUM. 3 buttons at the collar.