Here are the materials from the Sofia collection:


"Silk":

056 - Black Silk
090 - White Silk
332 - Light Gray Silk
330 - Dark Gray Silk
333 - Ash Pink Silk
331 - Slate Silk


touchflex

216 - Ivory
220 - Satin Ash
221 - Silk Oak
222 - Pecan
223 - Rocky Oak
224 - Gray


Those who work in V-Ray versions lower than 3.1, be careful, in the materials in the BRDF section there is Microfaset GTR ( GGX ), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - whatever suits you best.