As you can see here, it doesn't require that much effort for a man to look casually smart. Just wear a puffer jacket and a long sleeve shirt and you'll look incredibly stylish. To introduce some extra fanciness to this getup, introduce a pair of burgundy leather oxford shoes to this outfit. As you head into your 30s, you probably want to start dressing in a classier manner. In this case, looks like this are a safe bet.