To join the lining fabric, add 0. 8 in (2 cm) to the width and sew them together lengthwise. You’ll have a 0. 4 (1 cm) wide seam in the middle).

If you’re using non-coated lining fabric that could fray, fold over 1/2 inch (1. 3 cm) along the top of the lining fabric before you pin the tape in place.

The lining should be securely attached to the header tape. If you’re working with a thick fabric like canvas, use a heavy needle with a ballpoint for an easier sew. [3] X Expert Source Alessio IadiciccoApparel Manufacturing Specialist Expert Interview. 16 June 2021.

If you’re not hemming the lining because it’s coated fabric, don’t add the extra length.

Iron-on tape can make your curtains appear stiff, so try sewing the liner if you prefer a more natural drape. Most iron-on tapes won’t be sturdy enough to support the weight of the curtains and liners, so only use this for very light fabrics.

Most thermal liners are made from cotton, polyester, or a blend.

Blackout curtains will also protect furniture and rugs from fading.

Try using water repellent or resistant lining on kitchen or bathroom curtains since these are high humidity rooms.

Check the materials of the plain lining since some may be made with polyester and cotton. [12] X Expert Source Donna SerinoDry Cleaning & Alterations Specialist Expert Interview. 31 August 2021. The polyester will prevent the cotton from shrinking, if you’d need to wash the lining.