The bias strips will be cut and sewn in class, some people may not know how to do them so it's a lesson all it's own. The "seams-so-soft" is used to stabilize the neckline and keep it from gaping as is the swimsuit elastic. Students can bring one or both of these items to see the difference between them to make a more informed decision in the future as to which is best based on the fabric and cut of the garment. The swimsuit elastic can be purchased by the metre, under $1.00 and the seams-so-soft is in a package in white or black. Hope this cleared up any muddy point.....
Maria Calautti, "Jack of all trades"