To make the scene look more realistic we will add a small wind force from the back of the curtain. In the Front Viewport go to Create > SpaceWarps > Forces > Wind and place it in the center of the curtain (the size of the wind icon is not important but its position is). In the Wind Parameters type: Strength=0.2; Decay=0; Turbulence=1. In the Left Viewport drag the wind to the back of the curtain (make sure that the wind is facing the curtain).
Select the curtain. In the Modify Panel click Cloth Forces to add the wind to the simulation. Now test the simulation. Play a little bit with the wind parameters and after you have a result that you like stop the simulation by pressing Simulate Local again and right click in any viewport and convert the object to editable poly. For a final touch add a Shell modifier to the cloth (from the Modifiers List) with Inner Amount of 0.1 and a MeshSmooth with 2 iterations. You can change the radius of the cylinder back to 1 now.
We have just opened our tutorial directory! Feel free to submit tutorials hosted on your website or other online tutorials that you think are worth mentioning.