You may want to make lined curtains to make the curtains thicker, or just to make your curtains look more professional. You can find curtain lining materials in most fabric stores with a home decor selection. If your curtain fabric is thick, you may want to pair it with a fairly thin lining fabric. Many fabric stores even sell linings for making blackout curtains, that prevent light from coming through, or thermal linings that can help your windows be more energy efficient. To install the curtains, you’ll need a plain or decorative curtain rod that’s slightly wider than the window. To make this style of lined curtains, choose a simple rod with no hooks.
Measure from the top of the curtain rod to a few inches below the window frame (or wherever you want the lower edge of the curtain). Measure the width of the curtain rod.
Calculate how much fabric you need by multiplying the window width by 1.5 or 2 and adding 6 inches, and adding 7 inches to the window height. To make two curtains for the window, divide the width calculation by two. For example, for a 64” square window, you’d need two pieces of fabric, each about 54 inches wide and 71 inches (about 2 yards) long, or 4 yards total.
Buy fabric for the main part of the curtain and matching thread. Buy the same amount of lining fabric. Make sure both fabrics are about the same width.
Cut the lining fabric 3 inches narrower and 3 inches shorter than the main fabric.
Spread out the main fabric right side down on a large flat surface. Place the lining fabric right side up on the main fabric. Center the lining fabric on the main fabric, so that you have 1 1/2 inches of extra main fabric on each side.
Fold one edge of the main fabric over 3/4 inch, so that the cut edge of the main fabric is even with the edge of the lining. Fold the main fabric over another 3/4 inch, so that the cut edge of the main fabric is enclosed, and it covers the edge of the lining fabric.
Press the folded edge, then pin it in place. Stitch along the folded edge using matching thread.
Repeat steps 6 and 7 for the other edges.
Fold the top edge of the curtain over 4 inches toward the lining side. Make sure the fold is even all the way across. Pin the fold in place, then stitch along the bottom edge of the fold, on top of the hem stitching.
Sew the second curtain the same way. Insert the curtain rod through the folded areas at the top of the curtains.
Measure carefully when making curtains. For thin fabrics, it’s best to make the curtains about twice as wide as the window. For thicker fabrics, 1.5 times is better, since too much fabric will create unnecessary bulk. When in doubt, it’s better to buy too much fabric than not enough.
Use caution when working with scissors, pins, irons and sewing machines.