Apple clearly was going for simplicity with this design. The case is slim and light, adding less than half an ounce to the weight of the iPhone. It’s made out of a single piece of reinforced, dyed leather, with a sheet of microfiber material lining the inside; notably, the lining is only on the back, stopping short of coming up along the edges. There is one more material used, and that’s a bit of black plastic lining the inside of the…