If you use a more relaxed approach to style, why not pair a red duster coat with flare jeans? For something more on the classy end to finish off your ensemble, complement your ensemble with red pumps.
Red Pumps with Flare Jeans Smart Casual Outfits
This casual pairing of a grey coat and flare jeans can take on different moods depending on the way it's styled. Let your sartorial sensibilities really shine by rounding off this getup with red pumps.