I have made similar card holders, for years.
They work in paper or fabric.
This year it is burlap.
To make cut rectangle 9x6".
Cut one each linen and burlap.
Fold in half and press crease. Trim off one side on diagonal. Right to crease.
Sew together around all sides and sew on a patch or other embellishment.
Sew around again and catch 12" ribbon on back in middle. (Back tie.)
Sew lace or other trim to the diagonal edge.
Tie a one loop bow with another piece of ribbon and hand sew in place with a button, this goes on the front at the corner.
If you make one I would like to see it.
The girl on holder is made of paper.