Cloth shading is a topic I have revisited over time. In January 2015 I have decided to release it to the Unity community as a Shader Forge graph at the asset store. I would be happy to see it used in your games. As you may see in the screens and video, you will be able to emulate key lighting behaviours of a wide range of fabric surfaces, from rough fabric such as towel or carpet, to silk or velvet.