Lined curtains hang better than unlined, give some degree of thermal and sound insulation and protect the curtain fabric from dirt, pollution and fading. Aluminium-backed insulating lining is available. Cotton sateen lining, traditionally beige, is available in other colours to match curtain fabrics. The amount of lining material required is about the same as that for the curtains they are to line, except in the case of repeat pattern curtains with their waste factor. To line curtains:
1. Cut lining 2 in. 50 mm) shorter and 1 in. (2.5 cm) narrower than the actual curtain.
2. Join widths for curtain and lining separately with ordinary seams.
3. Open out seams and press well.
4. Tack a 4 in. (10 mm) hem along the bottom and slip-stitch by hand.
5. Stitch a 1 in. (2.5 cm) hem along base of the lining.
6. Lock the two materials so that they hang together in the same folds.
7. Lay the curtain out flat, wrong side up.
8. Centre lining over it, with its hem 1 in. (25 mm) above the curtain hem.
9. Fold each lining selvedge over to meet the other down the centre, leaving the curtain flat.
10. Lock each fold to the curtain with a loose buttonhole stitch every 4 in. (10 cm), picking up only one thread of curtain fabric so that stitches are invisible on the right side. Curtains which contain two full widths must be also locked down the centre.
11. Turn in the sides of the lining to a distance of ½ in. (1.2 cm) from the tacked curtain edge and slip-stitch the lining to the curtain, letting bottom hems hang free from each other. 1
12. Check length from the bottom upwards, then fold over the raw edges and stitch curtain tape over them.
Use lining tape to make linings detachable for cleaning. Make up the curtains as though they were unlined (join the widths with ordinary seams). Make up the lining with side and bottom hems and sew lining tape along the top.
With heavier fabrics, curtain and lining need to be locked together with light stitches at intervals.