Many materials used for the outer window drapery should be lined, especially for windows subjected to the heat and glare of the sun. Lining is often desirable even when there are glass curtains, both for the protection of the material, if this is expensive or likely to fade, and for the effect in the room. Some fabrics are much more effective when lined; others are much handsomer unlined. The pattern in cretonne, for example, comes out much better when there is no lining, while in printed linens the pattern is often almost obliterated and the ground looks dense and dull if made up without a lining.

If the curtain to be lined has a heading, this should generally be made by turning over the outside material at the top, especially if the heading is likely to fall over, or is of plaits which are intended to turn over.

When curtains are to be fined, they should be placed face down on the table. After cutting off the selvage, which is otherwise likely to draw, the edges are turned in and basted down. The lining should be basted on to the outside first at the top, then across the curtain at frequent intervals throughout the length of the curtain. The edges of the lining are then turned in and basted to the outside, letting the edge of the lining come to about 1/16 inch from the edge of the outside. The curtain is finished at the top, and if it is of heavy material, allowed to hang for three weeks or more before finishing either the sides or the bottom.