This casual combo of a grey plaid flannel long sleeve shirt and a black crew-neck t-shirt is super easy to throw together without a second thought, helping you look on-trend and prepared for anything without spending a ton of time searching through your wardrobe. Introduce white canvas low top sneakers to the equation and ta-da: the outfit is complete. With springtime coming, it's time to sport simple and dapper combos, just like this. When it comes to casual fashion tips for 30-year-old gentlemen, this look looks great on almost any guy.