This pairing of a white and navy horizontal striped polo and white chinos is on the casual side but also ensures that you look on-trend and really stylish. Get a little creative with shoes and dress up this outfit by slipping into brown suede loafers. What an obvious choice for warm weather! As you step into your 30s, you probably want to start dressing like a grown man. In this case, outfits like this are a surefire option.