hello,i made a little tutorial maybe you already know how to do this but i didnt and when i was playing a bit with zbrush i made this silk or satin backround.
Cloth.zip
thanks pilou.i think when you turn images like the silk stuff above into a greyscale you can use it as a bump map for water or dunes,i dont tested it yet but i thought about it now.i think i will test this.
nice tut, thx for sharing