Seam binding could be put on the edges of seams to keep them from fraying or I think I used it more as an edge on hems. Didn't have to turn under the 1/4" and it let the hem be flatter. Stitch the seam binding along the raw edge and then hand stitch the hem in place. All rayon so very suitable for not making extra bulk in the piece. It's kinda like twill tape but different fiber?? One friend suggested using it to make casings in sleeves but I so rarely do clothing construction any more. It used to be economical but not so any more! Wow--price of patterns has certainly changed in my sewing life. Do many of us remember standing perfectly still to have mom use that hem marker all the way around so your hem was exactly so many inches from the floor! And to let your bra straps show--gasp!!!!!!