Boning,  3/4 inch wide with a cloth casing (the boning is 1/4 inch wide, the cloth casing that covers the boning is 3/4 inch wide – the cloth extends 1/4 inch on each side of the boning which gives a small stitching edge to use to sew the boning on to the seamline of your project),  feather fabric brand.

Boning is used to give extra strength and shape to the bodice of a dress. It is sewn along the seamlines in a bodice.