Attached Link: http://www.morphography.uk.vu/public/torndress.jpg

No disrespect to thefixer's image, but the trouble with transmapping is that the shreds of cloth don't hang as they should. If you're willing to put in the effort, shredding a dynamic cloth mesh in a modeller will give a more realistic effect - you will still need a transmap, by the way, to get the frayed edges correct. The link leads to a work in progress. I haven't attached it since it contains violence.