I make my own binding form poly cotton poplin , using a
3/4" wide Clover bias binder tool ( I have several different sizes).I buy enough fabric so I start out with a square of poplin ,cut it up using a rotary cutter into bias strips of the required size ,then using a steam iron (lower the steam to avoid burning fingers) pulled the strips through the bias maker,iron as it comes through.Fold the bias strips in half ,press again.Using a feather type stitch makes sure that the binding is sewn on securely.I cut all the fabric into strips but only make the binding as I need it.