An “invisible” hem is one where the stitching will hardly show on the outside. To do this, turn about 1 cm of the upper edge of the seam allowance outwards and hand-sew along this line, using slip stitches that only catch in 1 or 2 fabric threads of the garment’s fabric; the stitches can be bigger on the hem allowance. Do not pull the thread tight. You can also machine-stitch an invisible hem if you have the relevant attachment foot. To do so, baste the hem allowance about 2 cm below the edge. Fold the hem edge and stitch onto the hem allowance, only catching in 1 or 2 fabric threads of the garment’s fabric. If necessary, lengthen the size of the stitch and slight loosen the thread tension. For further details, see your sewing machine instruction manual.