Its not the original source cause I dont have that anymore but it was 
something like this:

#declare Velvet=
     texture{
         pigment{rgb<0.3,0.5,1>}
         finish{
             ambient 0 diffuse 1 brilliance 2
         }
         normal{bumps scale 0.001}
     }
     texture{
         pigment{rgb -<0.1,0.5,1> transmit 1}
         finish{
             ambient 0 diffuse 0
             specular 0.6 roughness 0.3 metallic
         }
     }
;

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