Last Updated: 29 October 2026
Quick Summary
To learn how to repair worn out children's clothing, start with a basic hand-sewing kit and match your method to the fabric: patch denim and cotton, darn wool socks and knits, and use a narrow zigzag on stretchy seams. Lock every repair with two backstitches, then wash it inside out on a gentle cycle and air-dry.
- A split seam is the easiest fix: pin the raw edges, sew a running stitch, then press flat.
- Sew on a button in about four minutes, using a toothpick to create a thread shank.
- Cut patches about 1cm larger on every side than the hole and whipstitch around the edge.
- Use a ballpoint needle on knits and a sharp needle on woven fabrics like denim.
- Skip the tumble dryer for mended garments, as heat shrinks thread and softens iron-on glue.
Table of Contents
- What You'll Need to Repair Children's Clothing
- How to Mend a Seam by Hand
- How to Sew On a Button
- How to Patch Holes in Children's Clothes
- Visible Mending for Kids' Clothes
- Repair by Fabric and Garment Type
- Making Repairs Last Through the Wash
- Repair, Alter, Repurpose or Recycle
- Frequently Asked Questions
What You'll Need to Repair Children's Clothing
Kids wear clothes hard: knees go first, then seams, then buttons. Learning how to repair worn out children's clothing saves money and keeps good garments out of the bin. A small repair beats a replacement every time.
You don't need a sewing machine. A basic hand-sewing kit covers almost everything:
- Needles: a pack of sharps in mixed sizes
- Thread: polyester all-purpose thread in white, black, navy and grey
- Small scissors: sharp, for snipping thread
Keep the kit in a small tin so a repair you can start in two minutes actually gets done.
How to Mend a Seam by Hand
A split seam is the easiest fix on this list.
Thread your needle and knot the end. Push the needle through both layers, then bring it back up about 5mm along the seam.
For a stronger join, backstitch: push the needle back through the previous stitch hole before moving forward.
Finish with two small stitches in the same spot to lock the thread, then snip. Press the seam flat with an iron so it sits neatly.
Don't pull the thread too tight; the seam puckers and the fabric pulls apart beside the new stitching.
How to Sew On a Button
Losing a button doesn't mean losing the shirt. Sew on a button in about four minutes with a needle, thread and a toothpick.
- Thread the needle and knot the end.
- Position the button over the marks from the old stitching.
- Push the needle up through the fabric and one button hole.
- Lay a toothpick across the button top and stitch over it. This creates a small thread shank so the button sits above thick fabric.
- Sew through the holes in a cross or parallel pattern, six to eight passes.
- Remove the toothpick and wind the thread around the shank a few times.
- Push the needle to the inside, knot, and snip.
Use a button the same size as the original; an oversized one won't pass through the buttonhole. On kids' clothes, check the buttonhole first: if it's stretched out, the button will pop off again however well you sew.
How to Patch Holes in Children's Clothes
Patching is how you save the knees. A good patch sits flat, moves with the fabric and survives the wash cycle.
Small Holes and Worn Knees
For a hole under a centimetre, try a simple darn first. For anything bigger, or a knee worn thin, use a patch.
Turn the garment inside out. Place the patch over the hole, pin it flat, and hand-sew around the edge with a whipstitch.
Press the patch flat when you finish. For a knee that's worn but not yet torn, sew a patch on the inside before the hole appears.
Darning Socks and Knitted Garments
Darning rebuilds missing fabric with new thread. Slide a darning mushroom or a smooth jar under the hole to hold the shape. Work rows of running stitches across the hole, then weave a second set at right angles, over and under the first.
Use wool thread for wool socks and cotton for cotton knits. Match the stretch of the garment, not just the colour. A rigid darn in a stretchy sock rubs and fails fast.
Visible Mending for Kids' Clothes
Visible mending turns a repair into a design feature. While mended clothes are in rotation, explore comfortable clothes for the school run for breathable fabrics and versatile layers.
It also solves a real problem: kids reject clothes that look "broken". A mended knee in a colour they chose gets worn.
Try these:
- Contrast thread: sew a seam in a bright colour so the repair reads as a detail
- Shaped patches: cut patches into stars, circles or hearts for small holes
- Sashiko-style rows: parallel running stitches across a worn area, worked in a bold thread
Get the child involved in picking the patch and thread. Ownership changes everything.
Repair by Fabric and Garment Type
The right repair depends on how the fabric is built, not just what it looks like. Stretch fabrics need thread and stitches that flex with them; woven fabrics take firmer stitching. Get this wrong and the repair fails in the first wash, or tears the garment beside the new stitching.
| Fabric or garment | Best repair method | Needle and thread | Patch choice | Watch out for |
|---|---|---|---|---|
| Denim jeans | Inside patch plus whipstitch | Sharp denim needle; heavy polyester thread | Denim offcut, similar weight | Blunt needles drag and fray the hole; use a thimble |
| Cotton tees | Small darn or jersey patch | Ballpoint needle; all-purpose polyester | Cotton jersey offcut | Over-tight stitching puckers the knit |
| Knit jumpers | Darning | Blunt tapestry needle; matching wool | Wool yarn, not fabric | Rigid darns crack in stretch |
| Wool socks | Woven darn | Darning needle; wool or wool-blend yarn | None, rebuild with yarn | Sharp edges on the mushroom snag the knit |
| Activewear | Narrow zigzag by hand or jersey patch | Ballpoint needle; polyester or nylon thread | Stretch jersey offcut | Iron-on patches stiffen and crack |
| School trousers | Seam repair, then knee patch | Sharps; all-purpose polyester | Cotton twill or poly-cotton | Pressing without a cloth shines the fabric |
Why the needle and thread matter
A ballpoint needle pushes between the loops of a knit instead of piercing them, so jersey and activewear don't run. A sharp needle cuts cleanly through woven fabrics like denim and cotton twill.
Thread follows the same logic. All-purpose polyester has some give, which suits most children's clothing. Pure cotton is stronger but has no stretch, so it snaps in stretchy seams.
Adapting the stitch to the seam
A straight running stitch is fine on a woven seam that doesn't move. On a stretchy seam, the shoulder of a tee, the cuff of a tracksuit, work a narrow zigzag by hand: small diagonal stitches that flex when the fabric stretches.
For a seam that takes load, such as a trouser seat or a sleeve underarm, backstitch instead of running stitch, because each stitch locks through the previous one.
Troubleshooting common problems
- Puckering: the thread is too tight or the stitches are too long for the fabric. Ease the tension and shorten the stitch.
- Fraying at the patch edge: the patch was cut with blunt scissors or the edge wasn't enclosed. Pink the edge or turn it under before stitching.
- Patch lifting at the corners: the patch is stiffer than the garment, or the stitches are too far apart. Use a closer whipstitch and a patch closer in weight to the garment.
Making Repairs Last Through the Wash
A repair that fails in the first wash wasn't finished properly. The fix is part stitching discipline and part laundering routine, and a quick test before the garment goes back in the drawer.
Lock the thread properly
Finish every repair with two small backstitches in the same spot, not a single knot. A knot works loose in the drum; a backstitch locks the thread into the fabric. Leave a short tail and trim it close rather than cutting flush, so the end doesn't pull back through.
Test the repair before washing
Before the garment goes in the machine, check three things:
- Stretch: pull the repaired area gently in the direction the garment moves. If the stitches resist and the fabric around them puckers, the repair is too rigid; add a few zigzag stitches or replace straight stitching with a flexing stitch.
- Seam strength: tug the seam along its length. It should hold without the stitches opening. If it gapes, add a second row of backstitch.
- Patch edges: run a finger around the patch perimeter. Any corner that lifts gets a few extra whipstitches before washing, not after.
Wash repaired items differently
Turn repaired garments inside out before washing. The drum rubs less on the repair, and the patch or darn takes the abrasion instead of the seam.
Skip the tumble dryer for mended garments: heat shrinks thread and softens iron-on glue, and tumbling works repairs loose. Air-dry flat or on a line instead.
For stretch garments, follow the same routine you'd use for how to wash premium activewear properly so stretch and stitching survive repeated laundering. The habits in our tips on how to maintain clothing shape longer also cut future wear before it starts.
Match the wash routine to the repair type
| Repair type | Wash setting | Dry | Extra step |
|---|---|---|---|
| Hand-sewn seam | Gentle cycle, inside out | Air-dry | Check seam after each wash for the first month |
| Whipstitched patch | Gentle cycle, inside out | Air-dry flat | Re-press the patch edge occasionally |
| Darned sock or knit | Gentle cycle in a mesh bag | Air-dry flat | Avoid fabric softener, which coats the wool |
| Iron-on patch with edge stitching | Gentle cycle, inside out | Air-dry | Never tumble-dry; glue softens with heat |
| Zigzag stretch repair | Gentle cycle, inside out | Air-dry | Stretch gently while damp to reset shape |
Repair, Alter, Repurpose or Recycle
Not every garment earns a repair. Some need a decision instead.
- Repair: sound fabric, one clear fault. Fix it.
- Alter: fits badly but wears well. Take in a waist or shorten a hem.
- Repurpose: too far gone for wearing. Cut into cleaning cloths, patch fabric or a craft project.
- Recycle: worn through, stained and beyond saving. Use a textile recycling drop-off rather than the bin.
The test is simple: will the child wear it after the fix? If the fabric itself is the problem, our guide to choosing durable everyday clothing explains what to look for next time, and our breakdown of why premium fabrics last longer shows why better fabric is worth repairing.
Buying fewer, better pieces is the real fix. MIVA Clothing designs relaxed, durable everyday and activewear, built to last and made with considered fabrics. Free delivery applies on orders over £100, and new customers get 10% off their first order.
Frequently Asked Questions
How do you fix a loose button on children's clothing?
Thread a needle with matching thread and knot the end. Anchor the thread under the button, then sew through the buttonholes several times to rebuild the stitching. If the button has a shank, wrap the thread around the stitches beneath it to create a small stem. Finish with a few backstitches on the underside and trim. Check the other buttons while you have the needle out, since they often loosen together.
How can you make children's clothes last longer?
Wash less often, use cold water and turn garments inside out before washing. Repair small holes and loose seams as soon as you spot them, before they grow into bigger jobs. Rotating a smaller wardrobe of durable pieces and airing clothes between wears also helps. Choosing relaxed fits with room to grow, in considered fabrics, gives kids more wear before anything wears out.
What can you do with children's clothes that are too worn to repair?
Cut them into cleaning cloths, patch fabric or craft supplies. Some charities and textile recyclers accept worn garments for fibre recovery, so check locally before binning anything. If only one area is damaged, such as a knee, you can often repurpose the garment as play clothes or shorts. Buying less and choosing durable pieces from the start reduces how much ends up as textile waste.
Can you repair a stretched or split seam?
Yes. Turn the garment inside out and pin the seam edges together, matching the original line. Backstitch along the seam with a needle and matching thread, then press the seam flat. For stretch fabrics, use a slight zigzag stitch so the repair moves with the fabric. If the seam has split in several places, reinforce the whole length rather than just the gap.
Most parents accept worn knees and loose buttons as a fact of life. They aren't. A basic sewing kit and twenty minutes turn a "ruined" garment back into a favourite. MIVA Clothing builds everyday and activewear from considered fabrics with relaxed fits, designed to be worn hard and repaired rather than replaced. Shop the collection and start with pieces worth mending.
