A navy and green plaid long sleeve shirt and olive cargo pants are an easy way to introduce muted dapperness into your daily casual arsenal. Let your styling credentials truly shine by finishing off this outfit with a pair of beige athletic shoes. When temps are getting lower and autumn is in full swing, you'll love this look as your go-to for summer-to-fall weather. Wondering how to nail casual style as you work your way through your 20s? This pairing is a great illustration.