Such staples as a beige trenchcoat and a denim jacket are the perfect way to infuse extra elegance into your current casual repertoire. To introduce a more laid-back finish to this outfit, complete your ensemble with a pair of black and white canvas high top sneakers. This one is a great idea when it comes to an awesome transition look. Those who are curious how to rock modern casual outfits as you get into your 30s, this ensemble should answer your question.