Here is a cycles leather shader based upon the Principled BSDF shader included in 2.79.
What you see is what you get:
There isn't any changing of settings to be done on your end, the product you buy is the exact same .blend file the renders were made with.
PBR Shader:
The overall shader is based on principled BSDF, blenders PBR shader. In other words, this leather material will look the same across various lighting conditions.
Easy Artist Control:
The shader comes with enough customization to be versatile without needlessly adding to the complexity.