Dress in a tan trenchcoat and brown chinos to put together a dressy, but not too dressy getup. Dress boots will give a more sophisticated twist to an otherwise mostly casual look.
Brown Chinos with Dress Boots Smart Casual Warm Weather Outfits
If you use a more laid-back approach to style, why not wear a grey leather biker jacket with brown chinos? You know how to inject a dash of class into this look: dress boots.