I'm not good at English, so I explain with a picture.
The cloth is prepared.
I have added the cloth which did a cross stitch.
Of course all the same cloth is OK.
Cloths sew and match it. In addition, the fold mark is put with the iron.
It folds according to the fold mark.
This is the state seen from the side.
Between 2 folds and 5 folds, careful not to be a gap
sew up the sides.
It's turned over.
There is also a pocket in the back.
The one of the stripe of the first photograph added the lace tape .
I think that you can make various covers with your idea.
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Have a happy day!