How do you do an ncloth curtain that concertinas?

[tonyhaer]

Hi i'm trying to model a curtain that concertinas as it is pulled back and then a tie back wraps around it. it is ncloth as i want it have a bit of movement like cloth. But i'm trying to figure out how to animate the curtain to concertina as it is pulled back and have it behave like ncloth.
Does anyone have any ideas? 

[daikath]

Perhaps you could check in the attribute editor under Dynamic Properties then under Dynamic Properties Maps and then put in a grayscale texture map, saying where it needs to be rigid and where not. Having it be rigid in the flat areas, but not rigd on the seams.

I don't know if black or white is stiff. But it should be easy to check, and a simple invert will change the values back.