Button Hole Elastic is elastic tape with buttonholes woven that run the length of the centre of elastic. Buttonhole elastic is generally used in the back of waistbands, it lets the back waistband to be pulled in. Buttonhole elastic is ideal for the waistline of children's and maternity garments. The elastic lets the waistband to be taken in and out (thighten/ loosen) to adjust the sizes without having to replace the garments.