Styling a denim jacket for different seasons is all about layering and adapting to the weather. For spring, pair your denim jacket with a lightweight dress or skirt and sneakers or sandals for a casual and chic look. In summer, throw your denim jacket over a tank top and shorts or a sundress for added warmth on cooler evenings. Transition into fall by layering your denim jacket over sweaters, long-sleeve tops, or turtlenecks and pairing with jeans or trousers. In winter, layer your denim jacket under a coat or overcoat for added insulation and style.