To sew a curved hem, start by making sure the skirt or dress is nicely pressed, with no wrinkles in the raw hem area.
Switch your sewing machine to a basting stitch.
Stitch 1/4″ from the edge, all around the hem.
Fold right on the newly sewn stitch line, using this basting stitch as a guide.
Press and remove the basting stitch.
Stitch again, 1/8″ away from the edge, using the same basting stitch settings. This stitch is optional but particularly helpful for beginners. If you're more advanced, you can skip this stitch and move to the next step.
Sewing the final hem
Measure 1″ away from the edge, towards the interior of the skirt and mark with a fabric marker. This is where the seam gauge comes in very handy! This will be your guide for the double hem.
Fold the edge up so it touches the line you just marked.
Place pins a few inches apart and add a couple more in between those.
Sew the final hem as close to the edge as you can
Finishing touches
Remove the second basting stitch.
Use plenty of steam and press firmly moving the iron up and down