Two years ago, I wrote that the Cappadocians wore square cloaks. Experiments with unstitched fabric demonstrate that I'm an idiot. Since only two corners are visible hanging in the front, and the lower hem appears to wrap straight around the body, the Cappadocian cloaks were apparently semicircular.
This will make cutting and (if necessary) finishing the edges a bit more complicated. The semicircular version of the Roman paenula was similar, if longer - going by the Persepolis reliefs, the Cappadocian cloak was shorter than the knee-length tunic - so we should be safe using a paenula pattern. Together with the arm fibula, this is what I intend to wear as rainwear to Marathon 2015.