If you're after a casual but also dapper outfit, go for a grey long sleeve shirt and navy jeans. Give a laid-back feel to this getup by rocking olive athletic shoes.
Grey Long Sleeve Shirt with Olive Athletic Shoes Warm Weather Outfits For Men
For an ensemble that's super straightforward but can be flaunted in plenty of different ways, try teaming a grey long sleeve shirt with white chinos. You can get a bit experimental in the footwear department and dial down your ensemble with a pair of olive athletic shoes.