Really Easy Cushion Cover

I found a pattern for an easy cushion cover on The Creek Line House blog. 
 https://www.creeklinehouse.com/the-10-minute-diy-pillow-cover/
Courtney's instructions were very good, but here is my slightly altered version.

For a 16 inch insert:

• Cut one piece of fabric 17 x 36.
• Fold up each short edge about a half inch.   Top stitch if desired.
• With right sides together, fold up about 9 inches on one side.   Fold the other side up until the size of the folded fabric is 17 x 16.   There will be about four inches of overlap.
• Pin the cut edges carefully.
• Sew the sides with the cut edges, using a half inch seam.
• Turn the cushion cover right side out.   Use a bamboo skewer to poke the corners out.
• Press.
• Top stitch all four sides about 1/4 inch from the edge.
• Insert cushion form.
• Admire your work.

That's all there is to it.   I can whip two of these up in about a half hour.   I used a light upholstery weight fabric for my first ones and that worked very well. 

For a 20 inch insert, the fabric would be cut 21 x 44.    The folded square, before the cut edges are sewn, should measure 21 x 20.   Other than that, the instructions are the same.