If you want to create a relaxed, unstructured and light look for your decorative or daytime blinds, you may not want to use lining. You will have to remember that the folds will more likely drape forming so called scalloped bottom 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 blind while still allowing some natural light to pass through the fabric. The visual look will also depend on the fabric you choose but be sure to see a more uniform and refined look for your blinds.

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.