Article: Your fabric should be twice the length you want your pajama pants to be. If your fabric is not long enough, then fold the left and right sides towards the middle instead.  If you have not already, it would be a good idea to wash, dry, and iron the fabric. This will remove any shrinking and coatings. Cotton or flannel work the best. If you live in a colder climate, fleece would also be a good option. Avoid stiff, coarse, or non-breathable material. Fold the pants so that the side seams match up, and the crotch is visible. Make sure that the back of the pants is on the outside. Most pants are larger in the back than in the front; if you fold them with the front on the outside, they may be too small.  Pull the crotch part out so that it makes a triangle. If you do not have any existing pajama pants, you can use sweatpants or any other loose-fitting pants with an elastic or drawstring waistband. This way, you won't have to sew the pants along the outside edges. Make sure that the waistband is 2 inches (5.1 cm) from the top edge of the fabric, and the cuffs are 1 inch (2.5 cm) from the bottom edge. If you plan to make more pajama pants for yourself, lay the pants down on a piece of tracing paper instead. This will give you a reusable pattern. Use a 1⁄2 inch (1.3 cm) seam allowance for the inseam and the crotch, and a 1 inch (2.5 cm) seam allowance for the bottom edge of the cuff. Use a 2 inches (5.1 cm) seam allowance for the waistband. Use chalk for dark fabrics and a pen for light.  When you reach the top, be sure to stretch the waistband out so that it aligns with the legs, otherwise your pants will be too narrow. Make any adjustments to your pattern as you trace it. This includes making the legs shorter, longer, narrower, or wider. Cut the first leg out, making sure that you cut through both layers of fabric. Use it as a template to trace and cut the second leg. You do not need to add seam allowances to the second leg, because the template already includes them. You will end up with 2 pieces of fabric, 1 for each leg.
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Fold a sheet of fabric in half, right sides facing in. Find a pair of pajama pants that fit you and fold them in half. Place the pants on top of the fabric, with the side seams along the fold. Trace around the pants leaving room for the seams. Cut the fabric out, then repeat the process for the other leg.