For a smart casual outfit, dress in a grey blazer and blue jeans — these pieces go really well together. A pair of tobacco leather brogues instantly ramps up the style factor of any ensemble.
Grey Blazer with Blue Jeans Dressy Warm Weather Outfits For Men
As you can see here, looking casually smart doesn't take that much work. Just wear a grey blazer with blue jeans and you'll look amazing.