Sewing ruffle trim is a straight seam with one key difference from regular seaming
Ruffle trim goes on the same way as any other trim — you line it up, pin it, and sew it down — but the ruffles themselves need to stay loose and bouncy as you work. The trick is keeping the gathered part of the trim free from the presser foot or your needle so the ruffles don't get flattened or caught. Whether you use a machine or hand-sew, you're stitching through the flat header (the straight edge at the top of the ruffle) while the ruffled part hangs below the seam line.
Most ruffle trim has a finished edge on the ruffled part, so you don't need to hem it. You're just attaching the trim to your garment or project by sewing a single line through that flat header strip. The whole job takes 15 to 45 minutes depending on how long the trim is and whether you're using a machine or hand-sewing.
Key Takeaways
- Ruffle trim attaches by sewing through the flat header strip at the top, not through the ruffled part itself.
- Pin the trim with the ruffles facing away from the seam line so they don't get caught under the presser foot or needle.
- Use a straight stitch on the machine or a running stitch by hand, staying close to the header edge but not so close that you split the fabric.
- Press the seam flat after sewing, but avoid pressing directly on the ruffles — press the header and the garment fabric instead.
- Ruffle trim works best on lightweight fabrics like cotton, linen, and voile; heavier fabrics can make the seam bulky.
Prepare your fabric and trim before pinning
Lay your garment or project on a flat surface with the right side facing up. If you're adding trim to an armhole, neckline, or hem, mark where the trim will go with a pencil or fabric pen — a light line helps you stay straight as you sew. Measure the distance you need to cover and cut your ruffle trim to that length plus 1 inch on each end for overlap or finishing.
Unroll the trim and let it sit flat for a few minutes. If it's been tightly wound on a spool, the ruffles may be creased. You don't need to iron them — they'll relax as you work — but spreading it out helps you see the header clearly and makes pinning easier. Check that the header (the flat strip) is straight and not twisted. If the trim has a selvage edge or a finished edge on the ruffled side, that finished edge should face outward when you're done.
Pin the trim in place with ruffles facing away from the seam
Position the ruffle trim along the line where you want it to sit. The flat header should align with your marked line or the edge of your fabric. The ruffles should point away from where your needle will go — if you're sewing the trim to the right side of the garment, the ruffles point outward, away from the body of the garment.
Pin every 2 to 3 inches along the header, pushing the pins through the flat part only. Keep the ruffles loose and unpinned — they should drape naturally below the header. If you're working around a curve like an armhole, ease the trim gently as you pin so it follows the curve without bunching. Don't pull the trim tight; let it sit naturally.
Machine-sew the trim using a straight stitch
Thread your machine with thread that matches your garment or the trim, depending on which you want to be less visible. Set the stitch length to 2.0 to 2.5 mm — a standard straight stitch. Lower the presser foot and position the needle so it will sew through the header, about 1/8 inch from the edge of the header closest to the ruffles.
Sew slowly and steadily, guiding the fabric with your hands but not pulling it. As you approach each pin, stop with the needle down, remove the pin, and continue. Watch the ruffles as you sew — they should stay loose and relaxed, not bunched up under the presser foot. If a ruffle starts to get caught, stop, lift the presser foot, and gently pull the ruffle away from the needle before continuing.
When you reach the end, backstitch three or four stitches to lock the thread. Trim the thread tails to 1/4 inch. If your trim has raw ends, fold them under 1/4 inch and stitch them closed by hand, or overlap them slightly and stitch through both layers.
Hand-sew the trim using a running stitch or backstitch
Thread a needle with thread that matches your garment or trim. Knot the end of the thread. Starting at one end of the trim, bring the needle up through the header from underneath, about 1/8 inch from the edge closest to the ruffles. This keeps your stitches hidden in the header.
Use a running stitch (in and out, in and out) or a backstitch (one stitch forward, one stitch back) to sew along the header. Keep your stitches small — about 1/8 inch long — and space them evenly. As you work, keep the ruffles loose and let them drape naturally. If a ruffle gets in the way of your needle, gently push it aside before you stitch.
When you reach the end, bring the needle to the back of the fabric and make three small stitches in the same spot to lock the thread. Trim the thread tail. If the trim has raw ends, fold them under 1/4 inch and stitch them closed by hand.
Press the seam without flattening the ruffles
Set your iron to the temperature recommended for your fabric — usually medium heat for cotton and linen. Lay the garment flat with the seam facing up. Press the flat header and the garment fabric on either side of the seam, but avoid pressing directly on the ruffles. The heat and pressure will flatten them, and they won't bounce back.
If you need to press the ruffles, use a pressing cloth (a thin cotton cloth or even a clean kitchen towel) between the iron and the ruffles, and use low heat with light pressure. Many sewers skip pressing the ruffles altogether and just press the header and garment fabric, which gives a clean finish without sacrificing the ruffle shape.
Common mistakes and how to avoid them
Sewing through the ruffles instead of the header: This flattens the ruffles and makes them look limp. Always stitch through the flat header only. If you accidentally catch a ruffle, pick out those stitches and resew.
Pulling the trim too tight as you sew: Tension in the trim makes the seam pucker and the ruffles look stiff. Let the trim sit naturally and sew at a steady, relaxed pace. If puckering happens, you may need to pick out the seam and try again with less tension.
Pressing too hard on the ruffles: A hot iron and heavy pressure will crush the ruffles flat. Press only the header and the garment fabric, or use a pressing cloth with light pressure if you must press the ruffles.
Not pinning enough: Ruffle trim can shift as you sew, especially on curves. Pin every 2 to 3 inches to keep it stable. On very long seams, pin more often.
Frequently Asked Questions
Can I sew ruffle trim on a curved seam like an armhole?
Yes. Pin the trim more frequently on curves — every 1 to 2 inches instead of every 3 inches — and ease it gently as you pin so it follows the curve without bunching. Sew slowly around the curve and let the presser foot guide the fabric naturally. The trim will sit smoothly if you don't pull it tight.
What thread color should I use?
Use thread that matches your garment if you want the seam to blend in, or match the trim if you want the stitching to be a design detail. Neutral colors like beige, gray, or white work on most projects. Test on a scrap first if you're unsure.
How do I finish the raw ends of the trim?
Fold each end under 1/4 inch and stitch it closed by hand with a few small stitches, or overlap the two ends by 1/2 inch and stitch through both layers. Some sewers leave the ends raw if they'll be hidden inside a seam or at a back closure.
Can I use ruffle trim on heavy fabrics like denim?
You can, but the seam will be thick and bulky. Use lightweight ruffle trim and consider topstitching the seam instead of a single line of stitching — this distributes the bulk and holds everything flat. Test on a scrap of your fabric first.
What if the ruffle trim gets bunched under the presser foot?
Stop sewing when ready, lift the presser foot, and gently pull the bunched ruffle away from the needle. Lower the presser foot and continue. This usually happens when the ruffles are pinned too close to the seam line or when you're sewing too fast. Slow down and keep the ruffles loose as you work.