Cut out all pieces as shown.
13.5 inches x 9.5 inches for the back, and cut just shy of 9inches and just shy of 13 inches, (meaning just under the measurement.) Also, cut two hearts out of the red felt that are slightly larger than the edge of your envelope closure. Place the two hearts together and blanket stitch around heart with white embroidery floss.
Using all six threads of embroidery floss, straight stitch around front of envelope using 1/4 in. stitches, 3/8 of an inch from edge.
Cut two straps for back out of the cotton print 15 x 3 in. The cut straps are not pictured. Turn straps right sides together and sew 1/4 in. from edge. Turn and press.
Step 1: turn and press the squared and acute corners. Make two small cuts in the inside front of the envelope as shown. Be sure that the raw edge is folded down and pin in place.Next bring up both sides. Press and pin.
Carefully pin the cotton fabric to the wool felt. Now you’re ready to sew your cotton fabric to your felt pieces.
Pin flap of envelope to the back. Be sure to line it up so your hand sewing will show when folded down. Sew together.