Apparel and quilting fabrics don't have the high thread count or weight of upholstery fabrics, but don't make them entirely a choice for curtain fabrics. They work well with lighter curtains, especially those designed to be decorative rather than functional. These fabrics can also be used for curtains that will only be hung for a limited time, such as short-term rentals or a child's room where tastes can change rapidly.
In addition to tulle, lined curtains have a more professional look, block light better and provide more insulation than unlined curtains. They also resist fading and look more attractive from the outside of the house when closed. White or unbleached cotton is often used to line curtains. Special blackout fabrics are specially used to line curtains and are a good choice for bedrooms. Insulating linings are another professional option that can keep a room warm in the winter, block drafts and potentially reduce heating bills. The interlining is an extra layer of fabric sandwiched between the curtain fabric and the lining, adding further insulation.