Yes, brown leather jackets can be versatile enough to be worn in both casual and formal settings, depending on the style and how you wear it. For a casual look, you can pair a women's brown leather jacket with a t-shirt, jeans or chinos, and sneakers or boots. This can be a great outfit for going out with friends or running errands. For a more formal setting, you can pair a brown leather jacket with a dress shirt, dress pants, and dress shoes. This look can work well for business casual settings or even slightly more formal events, like a dinner party or a date night.