Plain Seam with Bound Edges January 13, 2010 by Sabra Leave a Comment Plain Seam with Bound Edges Start by sewing a Plain Seam. Fold garment in half, right sides together. Fold bottom seam allowance under, leave top seam allowance flat. Slip bias tape over top edge of seam allowance. Edgestitch along the fold of the bias tape. Repeat on other seam allowance. Press seam open The book says: this seam “requires a bias tape and is desirable when sewing with fabric that frays easily. It is also used to bind the seams when sewing with furs.” And we all know how often I sew with furs.