Which Curtains are the Best for Blocking Light?

You can have a blackout liner added to any curtain we make. We cut the liner to fit and sew it inside the curtain between the two layers of fabric. All of our curtains give complete privacy even if they let a lot of light through . The "Soft Cotton" fabrics are very thin, but still give full privacy. Our 'Off White' is thicker than it appears in pictures.