5. Cut a piece of cardstock to a 4" x 5" (10cm x 13cm) rectangle and verify your heart fits comfortably within the space.  6. Cut a piece of scrap paper to 7-1/8" x 7-1/8" (18cm x 18cm). Set the paper at a 45˚ angle and set your cardstock just a little above center top-to-bottom and centered side-to-side. Use the 45˚ marking on your quilting ruler to verify you're lining things up squarely. Fold the corners in for the side flaps; they should just barely touch noses like an Eskimo kiss. Use your fingernail to score the side flaps where the top and bottom edges of the cardstock sit. You should have tiny triangles on the flaps at the bottom and larger triangles on the flaps at the top.&nbsp;  7. Crease the folds. You're now going to replicate the envelope shape in fabric. Keeping the paper version as a reference will be helpful when you go to fold and press your fabric.  8. Using a quilting ruler and rotary cutter, cut two pieces of cotton fabric to the same size as your pattern—7-1/8" x 7-1/8" (18cm x 18cm).