If you ever created characters, furniture, curtains, car interiors etc., you probably know that achieving a good fabric look is quite difficult. Not only you have to find good tileable texture online, but you also need to simulate correct appearance of the fabric which cannot be achieved with simple mix of diffuse and glossy shaders. So what I want to offer you is an uber-shader, made specifically for achieving believable fabric look. The shader is done after careful study and own implementation of many articles about the subject. 13 presets of most used in the prodcution materials should cover your needs in almost any project.
Advanced version also includes procedural effects modules (distortion, color variation, fuzz, ageing, thickness variations, stripes, dust)