Yesterday while shopping with my client for boots he picked up a pair I selected for him, which only came in brown, and said "It's too bad that I like these so much, I don't have a lot of brown clothes, and it's not okay to wear brown and black together."
Insert cartoon character coming to a screeching halt noise here. The old fashion rule that you can't wear black and brown has been overthrown, probably around the same time people started wearing white after Labor day (which is completely okay to do in case you were not aware).
Not sure how to incoporate the look yourself? Try a nice mix of black, brown, and grey. When worn together, rather than having to be matched, the three colors coordinate and compliment each other. The gent enjoying his metro paper in the photo above is a great example. He's wearing a grey plaid newspaper cap, black cable knit sweater, pants, and trench coat, finished off with brown suede shoes. It's a refreshing option to donning black from head to toe.