It runs true to size but it depends on your preference fit. Medium would have been okay but I prefer the relax fit because I dont the armhole to rub and creates friction on my armpit. The material is quite stiff and warm, therefore not suitable to wear during hot days especially in country where I live, a tropical country. Fitting is okay. I love its color but the neck is too close. It is only nice to wear in an airconditioned office.