Muslin is a woven cotton fabric. Its colour range varies from unbleached beige to white. This natural fabric is clear, neat, breathable, and has smooth texture. In addition to these good features, it does not cost much. Muslin is widely used in home decor for making bed sheets, duvet covers, pillow cases and curtains.
Prewash the muslin fabric in warm water to avoid shrinking your completed project. Iron the fabric.
Measure the area you want to cover with the muslin curtain. Whether it is a window or partition, you need just two measurements -- length and width.
Lay the muslin flat on the cutting table or floor. Cut the length of the curtain according to your length measurement plus the hem allowances to fold the curtain at the top and the bottom. At the top add 7.5 to 25 cm (3 to 10 inches), depending on the size of the curtain rod. At the bottom, add 10 cm (4 inches) for the hem. The width of the curtain will depend on the width of the area you are covering and on the amount of gathering you want to have. If 3 m (120 inches) is not enough to achieve the desired width, cut an additional piece of fabric to extend the width.
Fold 1.2 cm (1/2 inch) on the wrong side of the fabric and press. Fold the remaining 6.2 cm to 23.7 cm (2 1/2 to 9 1/2 inches). Pin the folded fabric evenly along the width, spacing pins 12.5 cm (5 inches) apart.
Thread your sewing machine and load your bobbin with cotton thread that matches your muslin. Put the fabric in the machine. To keep the stitching line parallel to the fold, place the seam guide on the right side from the needle. Edge stitch the folded end. Remove pins.
Fold 1.2 cm (1/2 inch) of the hem and press. Fold the remaining 8.7 cm (3 1/2 inches) and form the hemline. Pin the hem through all layers of the fabric every 12.5 cm (5 inches). Edge stitch the folded fabric, making sure the seam line is parallel to the fold. Remove pins.
Press the top and bottom hems of the curtain.
If you do not have a seam guide, you can use a painter's tape. Simply tape it on the needle plate at the level, where you need to control the seam and keep it straight.