Opt for a grey crew-neck sweater and olive chinos for a casual kind of class. For a more laid-back spin, complement this look with a pair of white canvas high top sneakers. Keep this combination in your front hall wardrobe when warmer days are here, and we promise you'll save time planning what to wear on more than one occasion. Guys wondering how to dress well as you pass the big 3-0, you have your answer.