https://www.3dtutorialandbeyond.com/store/corona-fabric-shaders/

Corona Fabric Shaders for C4D
We are proud to release our first product for Corona Renderer for C4D. Every material we made has been carefully crafted, starting with a proper data acquisition from real world samples to see how materials behave in real life and in different conditions, and then trying to reproduce all the shading properties with great accuracy. The result is a collection of over 600 high end fabric shaders accurately tested to be production proven, featuring high resolution textures (diffuse, specular, bump, normal, displacement, alpha map, from 3K up to 8K), chromatic variations of the same shader to quickly choose the one you need without tuning the color, all of that in a practical .lib4d file for the Content Browser in order to find easily what you are looking for. Many shaders have been builded in a modular way so that you can easily mix and match some characteristic to create even more great looking shaders.