A dark brown duffle coat and jeans are surely worth being on your list of wardrobe essentials. And if you want to easily level up your look with footwear, why not complement your outfit with a pair of tan leather derby shoes? On not-so-chilly days, you can sport this easy-to-transition getup and look absolutely amazing. The ability to pull off ensembles like this is one of the dividends of moving into your 30s.