If you want to create an airy, flowy and light look, you may want to skip adding lining to your curtains especially if privacy or intrusive light isn't on top of your worries. You will have to remember that you may not achieve a very structural, refined look, but instead a more relaxed and draped effect. This will very much depend on the fabric you pick.

Cotton lining is a great option if you want to protect your fabric from any potential sun damage, add structure and shape to the heading and pleats while still allowing some natural light to pass through the fabric. The visual look will depend on the fabric you choose but be sure to see a more uniform and overall sophisticated look for your curtains.

Blackout lining can often seem like a heavy and dark option however it is in fact white and does not differ much from the standard cotton lining in weight or texture. It is an ideal option for eliminating most of the outside light disturbing your night sleep or sharp sunlight. It also works as a thermal layer, helping to exclude any drafts.