A navy overcoat and dark brown chinos work together harmoniously. You could perhaps get a little creative with shoes and add a pair of dark brown suede tassel loafers to the mix.
Dark Brown Chinos with Dark Brown Suede Tassel Loafers Cold Weather Outfits
When the dress code calls for a casually sophisticated outfit, try pairing a black overcoat with dark brown chinos. To give your overall look a classier vibe, introduce a pair of dark brown suede tassel loafers to the equation.