What frills are and why they matter
A frill is a strip of fabric gathered or pleated along one edge so it creates a ruffled, decorative border. You attach it to the edge of a garment or project—a pillowcase, a dress hem, a sleeve opening—and the gathered side faces outward so the texture shows. Frills add volume, movement, and visual interest without requiring you to cut a complex pattern.
The basic technique is the same whether you're adding a frill to a child's dress, a tea towel, or a quilt edge. You cut a strip of fabric, gather one edge, and sew it to your main piece. Once you understand the core steps, you can adjust the width of the strip, the amount of gathering, and the placement to match what you're making.
Key Takeaways
- A frill is a gathered fabric strip sewn to an edge; you gather one long edge and attach the ungathered edge to your garment or project.
- The most reliable gathering method is to sew two parallel lines of long stitches, then pull the bobbin threads to bunch the fabric evenly.
- Cut your frill strip at least twice as long as the edge you're attaching it to, and cut it perpendicular to the grain so it has some stretch.
- Sew the frill to your main piece with the gathered side facing outward, using a straight stitch or a narrow zigzag to prevent puckering.
- Press the seam allowance toward the main garment after sewing so the frill stands away cleanly.
Cutting and preparing your frill strip
Start by deciding how wide you want your finished frill to be. A finished frill is usually 1 to 3 inches wide, depending on the look you're after. Add 1/2 inch to that width for seam allowance—so if you want a 2-inch frill, cut your strip 2.5 inches wide.
Next, measure the edge where the frill will go. Cut your frill strip at least twice as long as that measurement; three times as long gives a fuller, more dramatic frill. If your edge is 20 inches, cut a strip that is 40 to 60 inches long. Cut the strip perpendicular to the grain (across the width of the fabric) rather than along the length, because crosswise grain has a little give that helps the frill curve smoothly around corners.
If your frill needs to be longer than a single piece of fabric, join two strips end-to-end with a diagonal seam. Lay the strips at right angles, sew from corner to corner, then trim the excess and press the seam open. This creates a nearly invisible join when the frill is gathered.
Gathering the frill with parallel stitch lines
The most reliable way to gather is to sew two parallel lines of long stitches along the length of your strip, then pull the bobbin threads to bunch the fabric. Set your machine to a stitch length of 1/4 inch or longer—the longer the stitch, the easier it is to pull and the less likely the thread will break.
Sew the first line 1/4 inch from one long edge of the strip. Sew the second line 1/2 inch from the first line, staying within your seam allowance. Sew all the way down the length of the strip. Do not backstitch at the beginning or end; leave the thread tails long—at least 4 inches.
At one end of the strip, gently pull both bobbin threads (the threads on the underside) at the same time. The fabric will bunch up along the threads. Keep pulling until the strip is gathered to the length of the edge you're attaching it to. Distribute the gathers evenly by sliding the fabric along the threads, then wrap the thread tails around a pin to hold the tension.
If one thread breaks while you're pulling, you can still gather using the remaining thread, but it will take longer and the gathers may be uneven. To avoid this, pull slowly and stop if you feel resistance.
Pinning the frill to your main piece
Lay your main garment or project flat, right side up. Place the gathered frill on top of it, with the ungathered edge (the edge without the gathering stitches) aligned with the edge of your main piece. The gathered, ruffled side should face outward, away from the garment.
Pin the frill in place every 2 to 3 inches, pushing the pins through all layers. If your edge has corners—like the corner of a pillowcase—gather a little extra fabric at the corner so the frill turns smoothly without bunching or gapping. You can do this by pulling the gathering threads a bit tighter just before the corner, or by adding an extra pin at the corner and adjusting the gathers by hand.
Check that the gathers are even and that the frill lies flat against the main piece. If you see gaps or lumps, adjust the pins and redistribute the gathers until it looks right.
Sewing the frill in place
Set your machine to a straight stitch with a stitch length of 2.0 to 2.5 mm. Sew along the line where the gathering stitches end—usually 1/2 inch from the edge of your main piece. This seam holds the frill permanently in place and is hidden in the seam allowance.
Sew slowly and keep the edge of the presser foot aligned with the gathering stitches so your new seam is parallel to them. Remove pins as you approach them; do not sew over pins. If the gathers bunch up under the presser foot, stop with the needle down, lift the presser foot, and gently spread the gathers with your fingers before continuing.
Some sewers prefer a narrow zigzag stitch instead of a straight stitch because it flexes slightly and is less likely to pucker when the frill is gathered. If you use a zigzag, set the width to 1.5 to 2.0 mm and the length to 2.0 mm.
Finishing the seam and removing gathering threads
Once you've sewn the frill in place, press the seam allowance toward the main garment using a hot iron. This pushes the frill away from the garment so it stands out cleanly. If you're adding a facing or binding to the edge, press before you attach it.
Remove the gathering threads by gently pulling them out. Start from one end and pull slowly; the threads should slide out easily. If they resist, snip them in a few places with small scissors and pull again. Be careful not to pull so hard that you distort the gathers you just pressed.
If your frill is on a seam that will be enclosed (like a pillowcase seam), you can leave the gathering threads in place because they'll be hidden. If the frill is on an exposed edge, remove them so they don't show.
Adjusting frill fullness and width
The fullness of a frill—how much it ruffles—depends on how much longer your strip is than the edge you're attaching it to. A strip that is twice as long as the edge creates a modest frill; three times as long creates a fuller, more dramatic one. Experiment with different ratios to find the look you prefer.
The width of the finished frill depends on how wide you cut the strip. A 2-inch-wide strip (after accounting for seam allowance) creates a frill that is about 1.5 inches wide when finished. A 3-inch-wide strip creates a frill about 2.5 inches wide. Wider frills are more dramatic but also heavier; they work better on sturdy fabrics like cotton or linen than on lightweight fabrics like voile or lawn.
If your frill looks too thin or too flat, you may not have gathered it enough. Go back and pull the gathering threads a bit tighter, then re-press. If it looks too bulky, you can carefully trim a little width from the seam allowance, but do this only if the seam is find and you have room to spare.
Frequently Asked Questions
Can I gather a frill by hand instead of with machine stitches?
Yes. Use a needle and thread to sew a running stitch (in and out, in and out) along the line where you want to gather, leaving long thread tails. Pull the tails to bunch the fabric. Hand gathering takes longer and the gathers may be less even, but it works and gives you more control over where the gathers sit.
What if my frill strip is too short and doesn't reach all the way around?
Join two strips end-to-end before gathering. Lay them at right angles, sew diagonally from corner to corner, trim the excess, and press the seam open. When you gather, the seam will be hidden in the gathers.
Do I have to use the same fabric for the frill as the main garment?
No. A contrasting fabric can look striking—a white frill on a colored dress, or a patterned frill on a solid garment. Just make sure the frill fabric is similar in weight to the main fabric so it gathers evenly and doesn't look limp or stiff by comparison.
How do I sew a frill around a corner without it bunching?
Gather a little extra fabric at the corner by pulling the gathering threads tighter just before you reach it. Pin the corner carefully so the frill turns smoothly. You can also add an extra pin right at the corner and adjust the gathers by hand to distribute them evenly on both sides of the corner.
Can I add a frill to an edge that's already finished with a hem?
Yes, but it's easier to add the frill before you hem. If the edge is already hemmed, you can sew the frill to the fold of the hem, but the seam will be visible on the inside. It's cleaner to unpick the hem, attach the frill, and then re-hem over the frill seam.