A knife edge pillow is two pieces of fabric that have been sewn together around the edges, forming a “knife edge” or a sharp, simple seam.
A “box” pillow is made with flat sides. Unlike the knife edge pillow that is flat at the seams, a box pillow has taller edges and is constructed like a box.
Shirred Box Pillow:
The sides of the “box” can be made of flat fabric or shirred (gathered) fabric, and it can match the top of the pillow or contrast it.
This is when the needlepoint canvas is inserted within a “frame” with mitered edges. This can be done in a boxed or knife pillow.
Cording is an easy way to add a little extra to a decorative pillow. The cording can be made in a contrast fabric which complements the pillow fabric. Or, a pillow can be self-corded, which means that the cording is made from the same fabric as the pillow. See above photo.
Instead of cording, a ruffle can be added to the edge of a knife pillow. Or Tassels can be added to pillow edges