The drapery fabric you select for your window coverings can help to control the amount of light coming into your room. A lighter-weight fabric allows more sunlight in for a brighter space. If your goal is to make the room darker, you can choose a heavier fabric and darker color. The curtain lining you select can also influence this since a thicker, heavier liner will be able to darken a room. The lining you select to back the drapery fabric can also be used to control moisture on the drapes keeping them looking good for a longer period of time.