Some say use good quality muslin but others say that it stretches over time. To sum up all the results from all my research the fabric suggestions vary from upholstery fabric, denim and high thread count cotton to Kona white, muslin, and to whatever you have on hand. I am on my way to HOme Depot for hubby and to Joann'a for me so please, please tell me what fabric you used to make your leader cloth. I am not inclined to buy a pre-made one. Thank you!