Buy the same jeans twice, in the same size, a few months apart, and you may not get the same jeans. The second pair turns out a shade darker, and after its first wash the side seam creeps round towards the front of your shin. Both changes were set at specific steps of the jeans production process, long before the pair reached the shop.
The twist? The brand on the label is often not the company that made your jeans. Many brands have no production floor of their own: they design and sell the jeans, and a contracted denim garment manufacturer makes them under the brand's label, which is called private-label or OEM production. A fabric mill weaves the denim, the garment maker turns it into jeans, and a partner laundry often gives them their final colour.
Turkey, home to the factory we look at later on, is one of the countries where that contract work is done. Here is how jeans are made, who does each step, and what each one explains about your pair.
The jeans production process, step by step
The order below is the usual jeans manufacturing process in a cut-and-sew denim factory.
1. Development and sampling
Who: the brand and the garment maker, together.
The brand brings the design: a sketch or reference pair, the fit, the fabric, the wash. The garment maker turns it into samples, the brand corrects fit and details, and the last round is the pre-production (PP) sample, sewn from the bulk fabric and trims and given the bulk wash. Bulk production starts only once the brand approves it, and from then on the PP sample is the reference every later check is measured against.
In your pair: the fit you tried on was settled here.
2. Fabric and trims
Who: the fabric mill, then the garment maker.
The mill dyes the yarn, weaves the denim and finishes it. The garment maker sources that fabric along with the trims (thread, buttons, rivets, zips, labels, pocketing) and stores it until cutting. As general practice, rolls are checked for faults and shade, and a test piece is washed to measure how much the fabric shrinks in length and width.
In your pair: the weight, the stretch and the feel of the denim were chosen here.
3. Pattern, spreading and cutting
Who: the garment maker.
The pattern is graded into the size range, and the pieces for every size are laid out in a marker, a cutting plan that wastes as little cloth as possible. The denim is spread in layers on a long table, with the grain kept straight, and the whole lay is cut at once. Automatic cutting machines follow the marker accurately and consistently through every layer; what they can't do is straighten fabric that is skewed or was spread off-grain. The cut pieces are then bundled, so each pair is sewn from panels of the same layer and the same shade.
In your pair: whether the size up and the size down of one style fit like the same jeans starts here.
4. The sewing line and inline QC
Who: the garment maker.
On a jeans production line, each operator sews one operation or a few (pockets, yoke, fly, seams, waistband, belt loops) and bundles move from station to station. Inline QC checks the work along the line, so a fault is caught before the next operation hides it: a skipped stitch under a waistband is invisible once the waistband is on. Buttons and rivets go on before or after washing, depending on the hardware and the wash.
In your pair: flat-felled seams, bar tacks and rivets are made here, which is why our construction checks for jeans and our clothing quality checklist send you to look at them.
5. Washing, embroidery and print, often at partners
Who: often outside partners, such as a laundry, an embroidery unit or a print shop.
Many denim garment manufacturers send these steps out. Embroidery and print often go onto flat cut panels before sewing; washing comes after, on the sewn jeans. The laundry sets the final shade, the softness and any wear effects, from a gentle fade to rips. Denim still shrinks in the wash, so patterns carry a shrinkage allowance that brings the washed pair to its finished measurements.
In your pair: two things show up here that start earlier. Leg twist appears after washing, but it comes mainly from the twill's skew and torque, which the mill counters in finishing, and from spreading or cutting off-grain. Shade varies between fabric dye lots and between laundry batches, which is why each batch is matched to an approved wash standard.
6. Finishing, final QC, packing and forwarding
Who: the garment maker.
The washed jeans are finished (threads trimmed, pressed, tagged) and go through final QC: measurements against the spec and its tolerances, the wash against the standard, workmanship against the PP sample. Then they are packed the way the brand specifies and forwarded to its warehouse.
In your pair: when the size chart's measurements match the jeans in your hands, this check did its job.
Where the things you notice are decided
| What you notice in the pair | Where it is decided | Who controls it |
|---|---|---|
| Two sizes of one style that don't fit alike | Grading, cutting accuracy, final measurement checks | The brand's spec and the garment maker |
| Legs that twist | Fabric skew and torque, spreading and cutting on grain | Fabric mill and garment maker |
| A different shade from your last pair | Fabric dye lots, laundry batches, matching to the wash standard | Mill, laundry and the garment maker's QC |
| Shrinkage at home | Fabric finishing, the shrinkage allowance, the garment wash | Mill, garment maker and laundry |
| Seams or belt loops that give way | Stitch type and density, bar tacks, inline QC | Garment maker |
| The softness and the fade | The wash recipe | Laundry, to the brand's approved standard |
Who needs a denim manufacturer, and how brands choose one
Almost every step above runs through one company: the denim garment manufacturer. It turns an approved sample into bulk, sources the fabric and trims, cuts, sews, checks and ships, and manages the partners for any step it doesn't do itself. For a brand, it is usually the single point of responsibility for the whole denim garment manufacturing process.
Who needs one
- Labels moving from samples to production, once a design needs more pairs than a sample room can make.
- Growing and direct-to-consumer denim brands that need fast sampling for new styles and dependable re-orders for the ones that sell.
- Brands adding denim to a range built on other categories, which need wash and hardware know-how their current suppliers may not have.
- Sourcing offices placing orders on a brand's behalf, which need answers they can compare across factories.
How to choose one: six questions
These follow the process above. Put them to every factory on your shortlist, in writing:
- How fast is a first sample, and what starts the production clock? Many factories count lead time from PP approval, so slow sign-off on your side moves the delivery date.
- How is fit checked beyond the sample size? Samples are usually made in one size and the pattern is graded into the others, so ask whether a size set, one pair in each size, is sewn, washed and measured before bulk.
- Which steps are in-house, and which go to partners? Above all the wash: ask how one wash standard is held across batches and partner laundries.
- Where does QC check, and against what? Inline checks catch faults a final check can't see; the final check should measure against your spec and the approved wash standard.
- Which independent audit covers the factory, of what type, and when? Ask for the details, not a logo. Sedex says on its own site that it is not a certification scheme and that its audit methodology has no pass or fail, so ask what the audit covered and what was followed up.
- What are the minimums per style, colour and wash? In denim, fabric and laundry batches carry minimums of their own, so flexibility can differ by style, colour and wash.
What to send first: the same five-point brief to every factory, so the answers are comparable: product type, quantity, fabric, wash and target delivery date, plus sketches or a reference pair if you have them.
One Turkish denim factory, measured against those questions
Urgan Textile is a denim garment manufacturer in Turkey that has made denim and non-denim garments since 1995 and serves brands in Europe and worldwide. Its HQ is in Istanbul, with a production facility in Kastamonu. It lists a 4,000 m² facility, 200 professionals and a sewing capacity of 3,000–6,000 pieces per day.
Its published org chart and service list map onto the six steps:
- Fabric and trims: sourcing of fabrics and trims, and a fabrics and trims warehouse.
- Development and sampling: an R&D department, with quick sampling in 7–10 days.
- Cutting: automatic cutting machines.
- Sewing: a sewing department.
- Washing, embroidery and print: handled through outsourced partners.
- Finishing, QC, packing and forwarding: in-house, with inline and final QC.
It puts its production lead time at 4 weeks after PP approval, and its minimum order comes with a promise of flexibility rather than a number. It is audited through Sedex, and its team follows fashion weeks and trend analysis to bring customers new ideas.
Why this example? It publishes its answers to several of the questions above: how fast a sample is, what starts the production clock and which steps run at partners. The minimum for your style and the details of its audits belong in the first conversation, as they would with any factory. Urgan's denim and jeans manufacturing overview walks through the same chain, from fabric sourcing to forwarding.
FAQ
Do brands make their own jeans? Some do, but many don't own a factory. They design the jeans, approve the samples and contract a denim garment manufacturer to make them under their label. The "made in" label tells you the country, not the company.
Why do jeans twist after washing? Twill denim has a built-in tendency to twist, which mills counter by skewing the fabric in finishing. If that isn't fully corrected, or the fabric was spread or cut off-grain, the leg seams rotate once the jeans are washed. In a shop, hold the pair up by the waistband: a side seam that already swings towards the front won't straighten with wear.
Why does the same style change shade between batches? Fabric is dyed in lots and jeans are washed in batches, and no two batches come out identical. Each batch is matched to an approved wash standard within a tolerance, so small differences are normal. If you want two pairs that match, buy them together.
Why does new denim rub off on a light bag or sofa? Indigo sits mostly on the surface of the yarn, so some of it transfers at first, especially from dark or raw denim. The trade calls this crocking, and brands have fabric tested for it before bulk production. A few cold washes, inside out, usually reduce it.
From one pair to a production run
If you came for the jeans: the next time a pair twists or comes out a shade different, you'll know which step decided it. If you're taking a denim line into production, send the five-point brief to Urgan Textile, ask what minimum applies to each style, and request a sample to evaluate before you commit.
This feature was produced with support from Urgan Textile, the denim manufacturer in the example above.