One of the classiest ways to style such a staple piece as a yellow dress shirt is to wear it with blue wide leg pants. A cool pair of loafers ties this ensemble together.
Blue Wide Leg Pants with Loafers Dressy Warm Weather Outfits
So as you can see, looking refined doesn't take that much work. Make a grey wool blazer and blue wide leg pants your outfit choice and be sure you'll look incredibly chic. A pair of loafers looks amazing here.