A curved hem follows the shape of the fabric instead of a straight line

A curved hem is sewn along a curve—the bottom of a circle skirt, the armhole of a sleeveless top, or the neckline of a garment. The challenge is that curved fabric wants to bunch and pucker as you sew, so you have to ease the fullness gradually rather than pulling it tight. The basic method is the same whether you sew by hand or machine: you mark the hem line, fold and pin the fabric in small sections, and stitch slowly so the curve stays smooth.

The difference between a curved hem and a straight one is mainly in how you handle the fabric as it moves under the needle. A straight hem lies flat naturally. A curved hem has extra fabric on the outer edge of the curve, and that extra has to go somewhere—either it gets stitched down smoothly, or it bunches into wrinkles. This guide covers both hand-sewing and machine methods, when to use each, and how to fix the most common problems.

Key Takeaways

  • Mark your hem line with tailor's chalk or a fabric pen before you fold, so you know exactly where the curve should sit.
  • Fold the hem in small sections—usually 2 to 3 inches at a time—and pin each section before moving to the next, rather than folding the entire curve at once.
  • Hand-sewing a curved hem with a slip stitch gives you the most control and the least visible stitching, though it takes longer than a machine.
  • Machine-sewing works well for curves if you use a walking foot, reduce your stitch length, and sew slowly so the presser foot does not pull the fabric unevenly.
  • If your hem puckers after sewing, you can often fix it by dampening the fabric, pressing it gently, and re-stitching the worst spots with smaller stitches.

Mark the hem line before you fold anything

The first step is to mark where the hem should fold. Measure up from the bottom edge of the garment the distance you want the hem to be—usually 1 to 1.5 inches for a curved hem. Use tailor's chalk, a fabric pen, or a tracing wheel to draw a light line all the way around the curve. This line is your guide; it keeps the hem width even and shows you exactly where to fold.

If you are hemming a circle skirt or a garment with a very tight curve, mark the line while the garment is laid flat on a table, not while wearing it. A tight curve can shift if you move around. For a gentler curve like an armhole, you can mark it on the garment itself. Use a ruler or a hem gauge to keep the distance consistent as you mark.

Fold and pin the hem in small sections

Do not fold the entire hem at once. Instead, fold it in sections of 2 to 3 inches, pin each section, and then move to the next. Start at a seam line or a point you have marked. Fold the fabric along your marked line, press the fold with your fingers or a hot iron, and insert a pin perpendicular to the fold every inch or so.

As you fold each section, ease the fabric gently so it lies flat without bunching. If you feel resistance—the fabric pulling or gathering—you have folded too much at once. Unfold, make your section smaller, and try again. The goal is a smooth fold that follows the curve naturally. Once the entire hem is folded and pinned, press the whole thing with an iron on a low to medium heat setting, using a pressing cloth if your fabric is delicate.

After pressing, you may want to baste the hem with long, loose stitches before you sew it permanently. Basting holds the fold in place while you work and makes it easier to catch any puckers before they are locked in with the final stitch.

Hand-sewing a curved hem with a slip stitch

A slip stitch is nearly invisible and gives you the most control over a curved hem. Thread a needle with thread that matches your fabric, and knot the end. Bring the needle up through the fold of the hem from the inside, so the knot stays hidden in the fold.

Insert the needle into the garment fabric directly across from where you came out of the fold—just a thread or two of the main fabric, not a deep stitch. Slide the needle along inside the fold for about 1/4 inch, then bring it back out through the fold. Repeat this motion: out of the fold, into the garment, slide inside the fold, out again. Keep your stitches small and even, about 1/8 to 1/4 inch apart. The thread should be almost invisible from the outside because it runs inside the fold most of the time.

Work slowly around the curve, checking the outside of the garment every few stitches to make sure the hem is lying flat and the stitches are not showing. If you see puckering starting, stop, pull out the last few stitches, and re-fold that section more gently before continuing.

Machine-sewing a curved hem

Machine-sewing is faster but requires care to keep the curve smooth. Use a walking foot if your machine has one—it feeds the fabric evenly from top and bottom, which prevents the presser foot from pushing the fabric unevenly around the curve. If you do not have a walking foot, a regular presser foot works, but you have to feed the fabric very slowly and deliberately.

Set your stitch length to 2.0 mm or shorter—shorter stitches hold a curve better than long ones. Use a stitch that will not unravel easily if a thread breaks; a straight stitch works, but a narrow zigzag (width 1.0 to 1.5 mm) is more forgiving. Position the needle so it stitches about 1/4 inch from the fold, catching both the hem and the garment fabric.

Sew slowly, guiding the fabric gently with your hands. Do not pull the fabric toward you or push it away; let the presser foot do the work. Pause every inch or so to check that the hem is still lying flat on top of the garment. If you see a pucker forming, stop, backstitch to find the thread, and carefully pull out the last few stitches. Re-fold that section and start again.

Fixing puckers and waves in a curved hem

If your hem puckers after you sew it, the most common cause is that you folded too much fabric at once or pulled the fabric as you stitched. The fix depends on how bad the pucker is. For minor waves, dampen the hem with a spray bottle, press it gently with an iron, and let it dry. This often relaxes the fabric enough to smooth out small puckers.

For deeper puckers, you may need to remove some stitches and re-sew. Use a seam ripper to cut and pull out the stitches in the puckered section. Unfold the hem, press it flat, and re-fold that section in a smaller increment. Then re-stitch with smaller stitches (1/8 inch or less) and less tension on the thread. If you are using a machine, reduce the presser foot pressure if your machine allows it.

If the pucker is very deep and you cannot smooth it out by re-sewing, you may have cut the fabric too short for the curve. In that case, you can add a facing or binding to the edge instead of a hem, but that is a different technique. For most garments, re-sewing with a gentler hand solves the problem.

When to use a curved hem versus other finishes

A curved hem works best on fabrics that do not fray much—cotton, linen, and stable knits. Slippery fabrics like silk or rayon can be harder to control because the fold wants to shift as you sew. For those, a narrow hem (1/2 inch or less) is easier to manage, or you can use a facing or binding instead.

A facing is a separate piece of fabric sewn to the edge and turned to the inside; it is more work upfront but gives a very clean finish and works on any fabric. A binding is a strip of fabric wrapped around the edge; it is visible but very durable and looks intentional on casual garments. A curved hem is the right choice when you want a straightforward, invisible finish on a stable fabric and you have time to work carefully.

Frequently Asked Questions

Can I use a serger to sew a curved hem?

A serger can finish the raw edge of a curved hem, but it does not fold and stitch the hem in one step the way a regular machine does. You can serge the edge first to prevent fraying, then fold and stitch the hem by hand or machine. Some people serge the hem allowance, fold it, and then use a regular machine to stitch it down, which combines the durability of a serged edge with the control of a regular stitch.

How wide should a curved hem be?

A curved hem is usually 1 to 1.5 inches wide. A narrower hem (1 inch or less) is easier to fold and stitch smoothly because there is less fabric to ease around the curve. A wider hem (1.5 inches or more) can work on a gentle curve but becomes harder to manage on a tight curve like a circle skirt. If your curve is very tight, a 1-inch hem is your best bet.

What if the hem keeps slipping as I sew?

Slipping usually means the fabric is too slippery for pins alone. Try using pattern weights or small clips instead of pins to hold the fold in place while you work. You can also baste the hem with long, loose stitches before you sew it permanently, which locks the fold in place. If you are machine-sewing, a walking foot also helps prevent slipping.

Do I need to press the hem after I sew it?

Yes. After you finish sewing, press the hem one more time with an iron on a low to medium heat, using a pressing cloth if your fabric is delicate. This sets the stitches and helps any remaining small waves relax. Press from the inside of the garment so you do not flatten the hem too much or create a visible crease on the outside.