If you have a brown suit almost nothing will look better than a blue and white striped shirt with a dark blue tie. Strong dark colours that work well together look more authoritative than the washed-out, everyday business ensemble of grey suit, white shirt and pale tie. The Italians do this a lot better and appreciate the values of a strong yet dark colour. But then it does tend to work best with darker skin.
Returning to blue and brown, try a dark brown tie (perhaps with a white club stripe) with a normal blue business suit. The strength of colour is often more satisfying than another dark shade - grey or blue for example. (It may also go well with those dark brown brogues. That's dark brown, not tan. But more on too-pale brown shoes later.)