One point to mention at this time. Don;t forget poser's other tools! In the picture I'm attaching shows a simple sitting position, 30 frame sim with the pose set at frame 5 (my standard) I don;t remember all of the cloth setting but I'll try to gather them. The picture on the left is the "raw" render after the sim, on the right is the "final" after about 10 seconds using the Poser Morph tool to smooth the folds.

Sorry I didn't add a chair etc but this was a test of the dress. By the way that is a hybrid dress the top is conforming and the skit is the dynamic group. I used soft select on the "hem" of the skirt to keep it's shape, which works good about 80% of the time, sometimes it causes and odd effect but again I've been able to correct that with a touch of the morph brush or even a little post work.

I know everyone ones a "one button" answer but as in most art, don;t be afraid of using ALL of the available tools.

click on the picture for a larger view.