⚡ Quick Answer: Sewing Stretch Lace
Stretch lace goes on in one direction and one rhythm. Join the ends into a loop, quarter the loop and the opening, sew the lace to the wrong side with a narrow zigzag while stretching only the lace, then flip it out, topstitch from the right side and press. The lace stretches, the garment edge does not, and that tension difference is what makes the finished edge sit flat instead of wavy.
An elastic waistband does the holding, and the fabric does the covering. A stretch lace edge does both jobs at once, which is why it looks so much lighter on a pair of knickers or a bodysuit leg and why it punishes a careless seam more visibly than elastic does.
The method below is the one used on handmade lingerie rather than the one written for knits in general. It covers the length calculation, the two passes, the scallop join and the settings, and every step can be done on a normal sewing machine without a serger.
What Makes Stretch Lace Different From Elastic
Stretch lace is knitted rather than embroidered, usually with a small amount of elastane in the ground. That ground is what recovers, and the motifs printed or knitted on top of it are what you see.
Galloon lace has a scalloped edge on one or both sides and a straight edge, called the heading, where the pattern finishes. The heading is the edge you sew along, and the scallop is the edge you let hang free.
Rigid lace, including most eyelash and corded laces, is embroidered on a mesh base with no elastic in it. It looks similar on a shelf and behaves completely differently on a body. If a lace does not spring back when you let go of it, do not use it on an opening that has to grip.
Narrow trim, roughly 1 to 2 cm wide, is the easiest to apply because it follows a curve without help. Wide lace is faster to fit but needs more careful easing around a leg opening.
A quick check tells you which one you are holding. Take the lace between both hands, stretch it across the width of a hand span and let go. A true stretch lace snaps back to its original width. A rigid lace stays stretched and slightly distorted, and that distortion is permanent.
What You Need Before You Start
The list is short because the method is short. Everything here is chosen for one property: it has to stretch with the lace or stay out of its way.
| Item | Why it is here | What to look for |
|---|---|---|
| Stretch lace trim | The edge itself, and the decoration | Springs back when stretched, scallop on at least one side |
| Polyester thread | Joins the lace to the garment | Matches the lace on the bobbin, matches the garment on top |
| Stretch or ballpoint needle | Passes between the filaments instead of cutting them | 70/10 or 75/11, 60/8 for very fine lace |
| Water soluble stabiliser | Stops the lace being pushed into the needle plate | A small offcut is enough for every join |
| Glass head pins | Marks the quarter points | Fine enough not to leave holes in the lace |
| Sharp small scissors | Trims overlapped ends close | Sharp to the tip, not the kitchen pair |
| Soft tape measure | Measures the opening relaxed | The flexible kind, not a metal rule |
Two of these are worth buying rather than substituting. A universal needle will cut the elastane in the lace ground, and cotton thread will snap before the lace gives. The stabiliser, on the other hand, can be replaced with a scrap of tear away tissue if the lace is firm.
Measure Before You Cut, Not After
The single biggest cause of a wavy lace edge is a lace loop that is too long for the opening. The second is a loop that is too short. Both are avoidable with two numbers.
Measure the length of the opening around the garment, with the garment lying relaxed. Write it down. Then measure the same distance on the pattern piece, because a pattern drafted for elastic includes a seam allowance that a lace edge does not need.
The useful comparison is not lace against opening but lace against opening under slight tension. Pinch the lace at both ends and pull until it is comfortable, not tight. If the stretched lace reaches the measured opening easily, that length will sit flat. If it has to be forced, the finished edge will pull in and cup; if it is slack, the edge will ripple.
| Situation | What it means | What to do |
|---|---|---|
| Stretched lace reaches the opening easily | The length is right | Cut at that length |
| Lace must be forced to reach | Too short | Cut a longer piece and retest |
| Lace sits slack with no tension | Too long | Shorten until it meets the opening under slight tension |
The lace carries the stretch and the garment edge does not. If you stretch the fabric while sewing instead of the lace, the edge will wave no matter how neat the stitching is.
The Settings That Decide the Finish
Four settings matter, and three of them are chosen before the needle touches the fabric.
The stitch. A narrow zigzag, roughly 1.5 to 2 mm wide and 2 to 2.5 mm long, is the standard for stretch lace. A three-step zigzag, sometimes called the elastic stitch, is stronger and is worth using on a waistband that will be pulled daily. Both allow the seam to stretch without the thread snapping.
The needle. A stretch or ballpoint needle in 70/10 or 75/11 for most stretch laces, and a finer 60/8 for very open, delicate lace. A sharp universal needle cuts the elastane filaments in the ground, and the failure shows up weeks later as a seam that suddenly gives way.
The thread. All purpose polyester, not cotton. Cotton thread has almost no stretch and will break before the lace does. Match the thread to the lace on the bobbin and to the garment on the top, which is the trick that keeps the stitching invisible from the outside.
The presser foot. Reduce the pressure if your machine allows it. Heavy pressure flattens the lace as it feeds and the seam looks fine on the machine and rippled on the body.
Do a test on a scrap of the actual lace. Sew a 10 cm length, stretch it gently, and look at the stitches. If the thread pops or the lace puckers between stitches, shorten the stitch and loosen the top tension a little before going anywhere near the garment.
Step 1: Join the Lace Into a Loop
Cut the lace to the length you settled on, then bring the two ends together with the right sides facing the same way. Overlap them by about 6 mm, no more, and check that the scallops run in the same direction all the way round. A loop that twists at the join cannot be fixed later.
Slip a small piece of water soluble stabiliser under the overlap, or a scrap of tear away tissue if the lace is firm. Sew across the overlap with a short, narrow zigzag, going back and forth twice. Trim the ends close to the stitching, then tear or rinse the stabiliser away.
Test the join before you go on. Stretch the loop until the seam is under load. If it holds and stays flat, continue. If it puckers, unpick it and try again with a slightly longer stitch, because a puckered join will show at the centre back of every pair you make with that lace.
Step 2: Quarter the Loop and the Opening
Divide the lace loop into four equal parts and mark each point with a pin. The join counts as one point, so fold the loop in half from the join to find the second point, then fold again to find the other two.
Do the same on the garment opening, starting from the centre front and centre back or from the side seams if the garment has them. Four pins on the garment and four on the lace.
Now match pin to pin and pin the lace to the garment at those four points only. Everything between the pins is distributed evenly as you sew, and this is the whole reason the method works. Without quarter points the lace creeps round as you sew and the tension is uneven by the time you reach the start again.
Step 3: Sew the First Pass
Place the lace against the wrong side of the garment with the scallop pointing away from the opening and the heading overlapping the fabric edge by about 6 mm. The right side of the lace faces the right side of the garment, so the lace will flip outward later.
Start at the join. Sew with your narrow zigzag, close to the heading edge, and stretch the lace gently between each pair of pins as you go. Keep the fabric underneath relaxed. Sew slowly, and watch the lace rather than the needle.
Go all the way round and overlap the start by a couple of centimetres. Lift the presser foot at the pins rather than sewing over them, because a needle that hits a pin bends or breaks and the seam jumps.
Stretch the lace, never the fabric. If the garment edge is being pulled as it goes under the foot, stop, release, and start again with a lighter hand.
Before the second pass, look at the seam from the wrong side. It should be flat along its whole length with no puckers between stitches and no lace left uncaught at the edge. If a section rippled, unpick just that section and redo it before you go on, because the second pass locks the first one in place.
Step 4: Turn It Out and Topstitch
Turn the lace to the right side of the garment and finger press it so the scallop sits where you want it. The raw edge of the garment is now enclosed between the lace and the wrong side, which is why there is nothing to overlock.
Sew the second pass from the right side, following the inner edge of the lace or the line of the scallop, whichever suits the trim. Use the same narrow zigzag, and stretch the lace as before so both passes stretch together.
The second pass is not decorative. It is what holds the fold in place and what stops the first seam from rolling outward in wear, and skipping it is the most common reason a homemade lace edge looks homemade.
Step 5: Handle the Leg Curves
Leg openings are smaller and more sharply curved than a waistband, and the lace has to travel a tighter circle in the same flat length. Apply the same method with one change: stretch the lace a little more firmly than you did on the waistband, especially through the curve under the seat.
Keep the lace width in proportion to the curve. A narrow lace of around 1 to 2 cm follows a leg curve comfortably. A wide lace tends to stand away from the curve at the sides, and no amount of pressing will train it down.
If the lace has a scallop, decide at the start whether the scallop should point down the leg or upward. Neither is wrong, and the choice has to be made for both legs at the same time, because unpicking a second pass is slow work.
Step 6: Make the Scallop Join Disappear
The join sits somewhere on the finished edge, and where you put it decides how visible it is. Position it at a valley between two scallops, or on the side seam if the garment has one, never on the tip of a motif.
Cut the lace so the pattern aligns at the overlap rather than so the length is exact. On a patterned lace, matching the motif across the join is worth a few millimetres of length either way, and the stretch test above gives you that tolerance.
For a wide lace waistband where the join would be obvious, join the ends with a narrow felled seam or a French seam, pressing the allowance open and topstitching each side. The seam stays flat, and a flat seam is invisible under a scalloped edge.
Step 7: Press Without Flattening the Motif
Press the seam allowance upward into the garment, working from the wrong side with a pressing cloth. Use a warm iron with little or no steam. Direct steam softens the elastane and a hot iron flattens the motifs into the ground, and neither recovers.
Do not drag the iron across the lace. Set it down and lift it, section by section, the way you would press a knitted hem. If the lace has a heavy motif that has been flattened, a burst of steam from a distance and a finger shape while it cools brings most of it back.
Let the garment cool completely before trying it on. Warm elastane stretches further than cool elastane, so a waistband that feels right straight off the ironing board will feel loose an hour later.
Step 8: Wash It So the Lace Keeps Its Recovery
Stretch lace survives because of the elastane in its ground, and heat and agitation are what destroy elastane. Wash in cool water, use a mesh bag if the garment goes in a machine at all, and skip the tumble dryer entirely.
Hang or lay flat to dry, away from direct heat. A radiator will do more damage in one evening than a year of careful wearing.
Store folded rather than hung. A hung garment puts its whole weight on the lace edge, and a lace edge that has been doing that for months does not spring back.
Troubleshooting
| Problem | Cause | Fix |
|---|---|---|
| Edge ripples all the way round | Lace loop too long, or fabric stretched while sewing | Shorten the loop and redo, stretching only the lace |
| Edge cups and pulls in | Lace too short for the opening | Cut a longer loop and retest on scrap |
| Pucker between stitches | Stitch too long or tension too tight | Shorten the stitch, loosen the top tension |
| Bump visible at the join | Overlap too wide, or join on a scallop point | Narrow the overlap, move the join to a valley |
| Seam gives way after a few wears | Sharp needle cut the elastane | Redo with a stretch or ballpoint needle |
Lace or Fold-Over Elastic
Fold-over elastic, covered in the fold over elastic guide, is faster, more forgiving and grips harder. It wraps the raw edge in one pass and it is the right choice for a first project, for a waistband that has to hold, or for a fabric that is heavy.
Stretch lace is lighter against the skin and looks like bought lingerie, but it gives less support and it shows every mistake. It works best on knickers, bodysuit legs, bralette bands and camisole edges, where the garment is not carrying much weight.
The useful compromise is a lace edge with a narrow elastic sewn into the same seam on a waistband, which keeps the look and adds the grip. That is one extra pass and one extra line of stitching, and it is what most small lingerie makers do on the waist and not on the legs.
Frequently Asked Questions
What is the best stitch for sewing stretch lace?
A narrow zigzag of about 1.5 to 2 mm wide and 2 to 2.5 mm long, or a three-step zigzag for a waistband that gets pulled daily. Both stretch with the lace so the thread does not snap.
What needle should I use on stretch lace?
A stretch or ballpoint needle in 70/10 or 75/11 for most stretch laces, and a 60/8 for very open delicate lace. A sharp needle cuts the elastane filaments in the lace ground and the seam fails weeks later.
How much stretch lace do I need for a waistband?
Cut the lace so it reaches the measured opening when it is stretched comfortably but not tightly. If it has to be forced it is too short and the edge will cup, and if it hangs slack it is too long and the edge will ripple.
Should I stretch the lace or the fabric when sewing?
Stretch the lace only, and keep the garment edge relaxed as it goes under the foot. Stretching the fabric as well is what produces a wavy edge, and no amount of pressing will flatten it afterwards.
Do I need a serger for stretch lace?
No. A normal sewing machine with a narrow zigzag or three-step zigzag does the job. The zigzag both joins the lace and finishes the raw edge, so there is nothing to overlock.
Why does my lace edge ripple?
Usually because the lace loop is longer than the opening, or because the fabric was stretched while sewing. Unpick and shorten the loop, then sew again stretching only the lace between the quarter point pins.
How do I hide the seam where the lace joins?
Position the join at a valley between two scallops, or on a side seam, and never on the tip of a motif. On wide lace, use a narrow felled seam and press it flat so the join disappears under the scallop.
Can I wash handmade lingerie with stretch lace in a machine?
Cool water, a mesh bag and no tumble dryer. Heat and agitation are what break down the elastane in the lace ground, so hand washing or a delicate cycle in a bag is the safe choice.
Conclusion
The job comes down to three things: a lace loop that matches the opening under slight tension, quarter points that distribute that tension evenly, and two passes so the fold cannot roll. Get those right and the settings are forgiving.
If the finished edge is not flat, the answer is almost always in the first pass rather than the second, and the troubleshooting table above names which part of it to change. Work on scrap until the stretch test and the quarter points feel automatic, then the garment will go together in an evening.
What are you making first, knickers, a bralette or a bodysuit leg, and did your lace pass the stretch check?
About This Guide
Written by Mithu, who sews lingerie for herself and for friends and has unpicked enough wavy lace edges to have stopped guessing at lengths.
The stitch settings, needle sizes and lace widths here follow the guidance used by lingerie suppliers and sewing machine makers, and standard practice in bra making. Every number can be confirmed on a scrap of your own lace before it reaches a garment.
All images in this article were created using AI.