CREATING A REALISTIC CURTAIN IN ADOBE PHOTOSHOP CS6/CC

Create a blank document,enter the details  in the image below .then click OK.

Then,Choose Edit Menu>>Fill>>50% Gray.See Image Below.

Then,choose Filter  Menu>>Render >>Fiber .set the values in the image below.(feel free to set the values of your linking,you can also opt to click the randomize button several times to see what you like)

The result looks more woody and not fabric like so,To actually create curtain folds we need to add a motion filter blur.Choose Filter Menu>>Blur>>Motion.Make sure your angle is 90/-90 to have folds run vertically. enter 538 for distance.See Image Below.

To separate the folds and make it more silky and smooth,we need the help of Gaussian blur.Choose  Filter>>Blur>>Gaussian Blur.I worked with 0.7 radius ,you can try out different amount.See Image Below.

To apply color,choose Image >>Adjustments>>Hue and Saturation.Check colorize,increase the saturation to 95% and reduce lightness to -50.See Image Below.

Choose Image>>Adjustments>>Levels.Enter 9 for inputs(blacks), 1.12 for mid-tones (grays) and 239 for outputs (whites).See Image Below

This should be your resulting image,yours might even be better!