You need 4 front pieces – 2 outer pieces and 2 linings. The linings should be cut carefully as mirror images of the top piece The second piece is the back piece. Cut that on fold as per the pattern ...
You need two front pieces from the outer fabric and lining in the dimensions – 19 inches wide and 17 1/2 inches long from the lining fabric and 19 inches wide and 18 1/2 inches long from the outer ...