As you can see, looking on-trend doesn't require that much effort. Team a blue trenchcoat with grey chinos and you'll look incredibly stylish. Put a more casual spin on your look by finishing with a pair of blue low top sneakers. It's is an appealing choice if you're figuring out a kick-ass summer-to-fall ensemble. This outfit illustrates how to succeed in the smart casual fashion department as a 20-year-old gent.