I'm attaching a detail of a Bouguereau canvas that is on display in the art museum in New Orleans. This is a masterful display of drapery painting.
The best way to learn to paint drapery like this is to arrange or hang a piece of cloth and draw or paint it. A drapery exercise is best done using only one natural light source. Light bouncing around a room or coming from more than one direction will make it much harder. If you can't use natural light, then light the drapery using just one spotlight.
Try squinting (or take off your glasses.) That will help you simplify and see values correctly.
Bill
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