Honestly though it could be awhile for me to get around to experimenting with the Poser end of this project but I'll let you in on a secret on how I made this render-

I bought these textures and tiled them into my dress's surface nodes and got a really convincing tattered look...I bet you could take any dress in your content library and make it just as tattered as this one with the textures in this product, link below

https://www.renderosity.com/rr/mod/bcs/?ViewProduct=136086