These jackets are generally less formal; however; they can be paired with both formal and informal trousers. To look dapper, you can pair them with jeans, that too darker styles to anchor your looks or lighter ones to look more casual. For something to fail-safe, the navy would be the best option. This is because the navy is ultra-versatile and complements a diverse range of colours. You can also try out grey, as this works for most complexions. Just understand your body type and know what suits you the best, so that you can get the perfect shade of jeans.