Quick answer
Most kids' clothes are retired for three reasons: a blown-out knee, a popped seam, or a stain nobody caught in time. All three are fixable in under twenty minutes, usually with an iron, a needle, and something already in your kitchen cupboard. Research by WRAP found that keeping a garment in active use for nine extra months cuts its carbon, water and waste footprint by roughly 20–30% — which makes a knee patch one of the highest-leverage things you can do with a Sunday afternoon.
Nobody buys children's clothes expecting them to survive unscathed. Knees meet gravel. Sleeves meet paint. A perfectly good pair of trousers gets set aside because of one hole the size of a two-euro coin, and then it never comes back.
The frustrating part is that a garment usually fails long before the fabric is actually worn out. The rest of the piece is fine. It's one small spot — and one small spot is a repair, not a write-off. Here's how to handle the five failures that account for almost everything.
Why bother mending at all
Beyond the obvious money argument, the numbers are hard to ignore. The European Environment Agency estimates that the EU generated around 16 kg of textile waste per person in 2022 — and only a fraction of that, roughly 4.6 kg per person, was separately collected for reuse or recycling. The rest went into mixed household waste.
There's a nice piece of local history here too: the very first Repair Café was held in Amsterdam in October 2009, started by journalist Martine Postma. There are now over 2,500 of them worldwide, and most run a textiles table staffed by someone who has patched more knees than you've had hot dinners. If you don't want to learn, you can simply turn up.
The five repairs that cover almost everything
| What went wrong | The fix | Roughly |
|---|---|---|
| Hole in the knee | Backing patch, sewn or ironed on | 15 min |
| Split side seam | Backstitch along the original seam line | 10 min |
| Missing button or snap | Replace; steal a spare from the inside hem | 5 min |
| Small hole in knitwear | Darning — weave new threads across the gap | 20 min |
| Set-in stain | Targeted soak, then wash cool | 30 min + wash |
How to patch a knee properly
The single most useful repair in a child's wardrobe. Two rules matter more than technique:
- Match the fabric weight. Patch denim with denim, jersey with jersey. A patch that's much heavier or lighter than the garment creates strain at the edges, and one of the two fabrics will eventually tear.
- Pre-wash the patch fabric. If it shrinks after the repair, it puckers the whole knee.
Cut the patch at least a centimetre larger than the hole on every side. Turn the trousers inside out and place the patch on the inside, over the hole — this is reverse appliqué, and it's both stronger and tidier than slapping a patch on top. Pin through the top layer only, then either iron on a fusible patch or sew around the edges with a small straight stitch. If you have a machine, a few passes back and forth across the hole itself will lock down the frayed edges for good.
One honest note on iron-on patches: they're fast, and they're brilliant on garments that only need to survive another season. On something you plan to hand down twice more, a few minutes of stitching around the edge will outlast the glue. Our oversized denim pants are cut heavy enough that a patched knee is genuinely worth the effort.
Visible mending, or: stop trying to hide it
Somewhere along the way we decided a repair should be invisible. Visible mending takes the opposite view — the stitches are the point. Sashiko, a Japanese technique whose name translates roughly as “little stabs,” uses rows of simple running stitch in a contrasting thread to hold a backing patch in place. It's forgiving, it's easy to undo if you go wrong, and it needs exactly one stitch in your repertoire.
It also happens to be the best trick we know for getting a child to accept a mended garment. A neat beige patch reads as damage. Nine rows of mustard stitching across a knee reads as a decision. Let them pick the thread colour and the repair stops being a compromise.
Stains: what actually works on cotton
Two principles do most of the work. Blot, never rub — rubbing drives pigment deeper into the fibres. And cold water for anything protein-based (milk, egg, blood); heat sets those permanently.
- Grass. Chlorophyll binds stubbornly to natural fibres. Soak the area in undiluted white vinegar for around 30 minutes before washing.
- Grease and food. A paste of baking soda and water, left on for at least 15 minutes, then washed as usual.
- Tomato and sauce. Cold water first, then a drop of dish soap worked in gently.
Test anything new on an inside seam first, and skip chlorine bleach on organic cotton entirely — it weakens the fibres, which rather defeats the purpose. Our full washing and care guide covers the everyday routine.
Repair before you hand it down, not after
The bag of clothes that goes to a friend, a sibling, or a swap tends to get packed in a hurry. Ten minutes of triage first makes an enormous difference to whether those clothes get worn or quietly re-donated.
Check every knee and elbow, tug gently at the side seams, count the buttons, and run a stain-check in daylight rather than under a kitchen bulb. Fix what's fixable, and be honest about what isn't — a garment with a failed elastic waistband and three holes is a rag, and that's a perfectly respectable end to its life. Everything else goes on to the next child, which is what our second-life pieces are built around in the first place.
FAQ
Do I need a sewing machine to repair kids' clothes?
No. Every repair described here can be done by hand with a needle and thread. A machine is faster for seams and lets you reinforce a knee patch with multiple passes, but hand-sewn backstitch on a split seam is just as durable.
Are iron-on patches strong enough for children's trousers?
They hold well for a season or two, especially if you apply them to the inside of the garment. The adhesive gradually breaks down through repeated washing, so for anything you intend to hand down, stitch around the edges of the patch as well.
What's the difference between darning and patching?
Darning weaves new thread across a hole to recreate the fabric, and suits knitwear and jersey. Patching adds a separate piece of fabric behind or over the hole, and suits woven fabrics like denim and canvas.
Can I still get an old stain out?
Sometimes. Stains that have been through a hot wash or a tumble dryer are largely set, but a long soak — vinegar for plant-based stains, baking soda paste for grease — is worth one attempt before you give up. If it doesn't lift, a well-placed patch or a bit of embroidery over the spot is a legitimate answer.
Where can I get help if I can't sew?
Repair Cafés run free drop-in sessions with volunteers and equipment, and most have a textiles table. The movement started in Amsterdam in 2009 and there are now over 2,500 locations worldwide, so there's a good chance of one nearby.
Is it actually worth repairing cheap clothes?
Environmentally, yes — the footprint of a garment is largely already spent by the time it reaches you, so every extra month of wear improves the maths. Practically, thin fast-fashion fabric tends to fail again beside the repair, which is a large part of why we make pieces heavy enough to be worth mending.