The short answer
- A grow-room hem is 1.5" of extra fabric folded and sewn inside the hem. Outside, the jeans look normal.
- Let it down when the hem sits above the ankle bone with shoes on, or when you can see sock while they stand.
- Expect a visible fold line on denim after letting down; washing and pressing soften it, but rarely erase it.
- It's a better plan than ordering long legs: the jeans fit now and later.
Children's legs don't grow on a schedule. School-age kids add a little over 2 inches of height a year on average, and some grow up to three times faster in one season than in another (HealthyChildren.org). That's why a pair that fits in September can be at half-mast by spring. A grow-room hem is the old dressmaker's answer: build the extra length in now and release it later.
How a grow-room hem works
A normal jeans hem turns the raw edge up once or twice and stitches it. A grow-room hem keeps more fabric inside that fold. On our kids' jeans it's 1.5" of extra length sewn inside, and you let it down later (+$8). From the outside it looks like any other hem. The inseam you ordered is the length they wear today; the 1.5" is in reserve.
How much is 1.5"? Leg length is only part of total height, so 1.5" of extra inseam covers a good share of a year's growth for many school-age children. It won't cover a big growth spurt on its own, which is why we always say: order the length that fits now.
When to let it down
Check with the shoes they wear most, standing straight:
- The hem sits clearly above the ankle bone.
- You can see sock all the way round while they stand (not just when they sit, which is normal).
- The jeans still fit at the waist and hips. If those are tight too, it's time for a new pair, not a longer one.
How to let a hem down: step by step
This works for a grow-room hem and, with less fabric to play with, most ordinary hems. Any local tailor can do it too, usually quickly.
- Wash the jeans first if they're new, so any shrinkage happens before you set the new length.
- Unpick the hem stitching with a seam ripper, working from the inside. Go slowly near the side seams, where layers are thick.
- Unfold the extra length and press the old fold flat with a steam iron and a damp cloth.
- Turn a new hem at the length you want, pin, and try them on with shoes.
- Stitch with a denim needle and strong thread. Matching the original thread color makes the new line less obvious.
The fold line: what to expect
Denim fades where it's exposed to washing and wear, and the folded-in part has been protected. When you let it down, you'll often see a darker band and a crease where the old hem was. A few washes and a good press make it less obvious; on darker washes it can stay visible. Some families don't mind (it's a badge of growth). If it bothers you, options include:
- turning the old fold line into a small cuff, so the darker band sits inside the turn-up;
- choosing a lighter or more faded wash, where the line shows less than on raw indigo or black;
- letting it down earlier rather than later, before the outer leg fades much further.
| Situation | Grow-room hem? | Why |
|---|---|---|
| School jeans meant to last the year | Yes | Covers a typical stretch of growth without ordering long |
| Child in an obvious growth phase | Yes | Gives you a second length when you need it |
| Jeans for one event or one season | No | You won't need the extra length |
| Child who likes a turn-up | Optional | A rolled regular hem can simply be unrolled; see how to cuff jeans |
| Waist and hips already snug | No | They'll outgrow the width before the length |
When not to rely on a grow-room hem
It's length insurance, nothing more. It won't help if the waist or seat is getting tight, and it won't rescue jeans ordered too long. Pair it with an adjustable button-elastic waistband if you want width flexibility too, and re-measure before every new order (here's how).
More on length: how long jeans should be, and when to alter jeans or start fresh. Shopping for a particular fit? See boys' jeans and girls' jeans.
Questions
Can I let the hem down myself?
Yes, with a seam ripper, an iron and a sewing machine with a denim needle. If you don't sew, any alterations shop can do it.
Will the let-down part look different?
Often a little. The folded-in fabric hasn't faded like the rest, so a darker band or crease may show. Washing and pressing soften it.
Can I order the grow-room hem and a longer inseam?
We'd advise against it. Order the inseam that fits today; the grow-room hem provides the later length.
My child likes a turn-up. Do they still need it?
A rolled hem gives some length back when you unroll it, but it adds bulk at the ankle. The grow-room hem keeps the extra length hidden instead.
