Doesn't it make sense that, since the socks fit iPods, they would also fit iPhones? They are very close in dimensions. I bought iPod socks for my old mini, then used them for my 5G, now for my iPhone. They're the best!
I went to the eye doctor for my annual exam and when there asked him about the Oakley style microfiber cases (basically a sock/sleeve) and if they had any for sale. They did, for 3$ each. I picked a few up. Protects it and is microfiber for cleaning the screen, if you care that much. I typically use me shirt for cleaning, but will use the microfiber if it is around.