I have one pair of elegant pillow shams done in an elongated diamond-shaped quilted fabric that is 85% polyester and 15% silk, so these have a really lovely sheen to them and look very expensive. They measure 28" Wide X 21" Tall in total and can hold any pillow that is 25-26" wide and 19" - 20" tall. These are manufactured by designer Thomas O'Brien. They have a hidden zipper along the back edge so they can open up really wide, making it super easy to insert pillows or take them out for washing or changing.
These are polyester/silk in a rich chocolate brown and have a satiny finish.
The front side of each sham has the an elongated diamond-shaped quilted pattern stitched into them, and the reverse back side is done in a matching solid brown fabric with no quilting.
These sell for $59.99 a pair and are like brand new.