If you don't like being too serious with your looks, consider pairing a grey crew-neck sweater with a navy plaid long sleeve shirt. Add navy canvas low top sneakers to the equation to loosen things up.
Navy Plaid Long Sleeve Shirt with Grey Crew-neck Sweater Outfits For Men
You'll be surprised at how easy it is for any gentleman to pull together this relaxed outfit. Just a grey crew-neck sweater and a navy plaid long sleeve shirt. Rounding off with brown leather casual boots is a fail-safe way to bring some extra zing to your ensemble.