Question: what is the difference between bias tape and seam binding?
Answer: Bias tape is cut on a 45 degree angle, or on the "bias". It will stretch a bit because of that and can be shaped to a curve. Seam tape is just a plain ribbon for seams and hems. ... When I was 12, I was taught to use "seam binding" (aka stretch lace) as one method to finish raw edges (like on a skirt hem).