A toss pillow can be cut and sewn a couple of different ways.
A Knife Edge (left) is just two pieces of fabric that are sewn together.
A Boxed pillow (center) has a band of fabric sewn between the front and back panels which allows for more fullness.
A pillow with Cut-Outs (right) is similar in fullness to the boxed pillow, but still has a single seam around the perimeter like a Knife Edge pillow. The third dimension is achieved by the perpendicular cut-outs at each corner.
|Left - Boxed Pillow|
Right - Cut-Out Pillow