As Americans we treat our denim shirts almost like jackets or overshirts. We wear them open over swimsuits or big and loose with shorts. Nothing wrong with that, and J. Crew is making a killing on that idea right now. However, the other way of working denim is the Italian way - super slim sexy denim shirts. They are almost always darted or seamed and worn with that Italian flair that reads formal and casual at the same time. I'm not saying which version is better, but just highlighting options.