This combination of a grey plaid long sleeve shirt and charcoal chinos is hard proof that a simple casual look doesn't have to be boring. To give your look a more relaxed vibe, complete your getup with a pair of grey athletic shoes. So if you're looking for a stylish winter-to-spring transition ensemble, you found it. When it comes to casual style for 30-year-old men, this look looks cool on almost any guy.