This is quick and dirty approximation but might be a start to something 
better:

#declare SilkTex =
   material {
      texture {
         pigment_pattern {
               wrinkles
               pigment_map {
                  [0.4
                     color rgb <1.0, 1.0, 1.0>
                  ]
                  [0.6
                     color rgb <0.0, 0.0, 0.0>
                  ]
               }
               scale  <0.2, 1.0, 0.2>
         }
         texture_map {
            [0.0
               pigment {
                  color rgb <0.45, 0.25, 0.75>
               }
               finish {
                  ambient 0.0
                  specular 0.8
               }
            ]
            [1.0
               pigment {
                  color rgb <0.45, 0.25, 0.75>
               }
               finish {
                  ambient 0.0
                  specular 0.05
               }
            ]
         }
      }
   }


Thomas

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