How to make the pleat for a mock box pillow

This is one of the variations to making a mock box pillow:

Step 1. Start with corner and the right side up. You will need to calculate the depth of the corner. This 1/2 of the depth of the cushion + 1/2" seam allowance.
Step 2. Bring the two cut edges together and press. Now, measure along the cut the depth of the corner and pin. Clip 1/4" into the seam allowance at the pin.

Step 3. Fold at the pin or clip along the cut edge and press. Mark the corner on fold with a pin.

Step 4. Open up the fabric with the right side up.

Step 5. Take the outside press marks and fold into the inside press mark. Pin to hold fabric into place.

Step 6. Cut off fabric extension on the corner even with the fabric edge.

Step 7. Baste at the seam line. Repeat this process with the other seven corners.

Happy Sewing!