Muslin is a thin, lightweight fabric made from cotton or cotton and polyester fibre blends. Muslin is rarely used to make clothing on its own, but it is often used to make pattern slopers, which clothing designers use to adjust a pattern before cutting out the item from the clothing fabric. Muslin is also used to make curtains, tablecloths and other simple fabric items for household use. Muslin is one of the easiest fabrics to work with and requires only standard sewing tools.
Wash the muslin in hot water, then dry in a machine dryer to preshrink the muslin. Muslin can shrink a lot, which will ruin garments if you do not preshrink the fabric ahead of time. After drying, iron the fabric with a hot iron to remove any wrinkles.
Use straight pins to attach the pattern pieces to the muslin. You can also use tailor's chalk to create the outline of the pattern pieces.
Cut the muslin fabric with sharp scissors. Dull scissors can ruin the lightweight weave of the fabric and cause runs to appear.
Use cotton thread with the sewing machine and attach a 60/8 sewing machine needle. Larger needles can damage the muslin weave.
Sew the muslin pieces together slowly to avoid pulling the fabric. Because the fabric is so lightweight, sewing too quickly can snag or rip the fabric.