https://www.posetteforever.com/viewtopic.php?f=68&t=2848&p=36430#p36430
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hanzoushinrei
Friday, 13 July 2007, 07:59 PM

Rendering Silk And Uh..shiny Cloths. (you'll Be Impressed!)
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instead of raising highlights to as high as 40% (colour-white) instead use this tip

Glossy at Alt Diffuse node
spec colour (base colour of texture)
KS 0.59
roughness .27
sharpness .02

for kinda heavier satin -

Phong
KS 1
roughness 0.51
sharpness 0.1

for dark clothes

Alt diffuse 

glossy (base colour white)
Ks .47
rough 0.45
sharp .51

maybe I should post some test pictures...oh it wont be a surprise.Just try it urselves! (Art Attack)