I could not love a classic khaki trench coat more. It looks great with basically everything. Put it on over a dress at night for some warmth, or over jeans for a casual day look - which is what I'll focus on today. Casual looks are all about taking basics and making them look chic in simple ways. So here, just take a striped shirt, light wash skinny jeans, and camel ballet flats as your base. Give the look polish and sophistication with a trench coat and quilted black bag. Add some square frame sunglasses for bright fall days. Without the trench coat, the look is very pedestrian, but add the coat and you've got a classic and timeless casual look.