I am 5'6 about 165lbs and the medium was true to size. It did not fit oversized. The arms were a little short but if you are rolling them up once it isn't a big deal. I like the style and the shirt but I think if I order another I would get a large to get a bit more of the oversized fit/feel.

Love this button up! Material is a good quality. I’ve gotten tons of compliments on it. An oversized fit so you could size down if you wanted it to be a slimmer fit.