Denim is an odd category in womenswear. Technically it looks like the easiest thing on the floor — a few panels, a couple of double-needle seams, anyone can run it. Yet the spread in quotes is the widest of any category we make, and the difference is almost entirely washing. The reason is simple: half of a denim style is created in the laundry, not on the sewing line. This is the specification, written in development order.
1. Fix three parameters first: weight, weave, stretch
Denim is not one fabric. An enquiry described as "jeans" can mean four different base cloths, with four different hands and four different prices:
- Weave. The standard is 3/1 right-hand twill — tight, firm, hard-wearing. Left-hand twill is rarer: softer, better drape, but it twists more easily, so watch the spreading direction on skirts and loose trousers.
- Composition. All-cotton is the orthodox choice and behaves the way denim is expected to behave on shrinkage and fading. Cotton-polyester is more stable and cheaper but fades in flatter layers. Blends with lyocell or Tencel soften the hand and improve drape for loose womenswear shapes, at the cost of some of the rigidity that makes denim read as denim.
- Weight. Denim is sold in ounces; 1 oz/yd² is roughly 33.9 g/m². Always confirm against the measured weight of the actual greige.
| Weight | Approx. g/m² | Typical use | What to watch |
|---|---|---|---|
| 8–9 oz | 270–305 | Summer denim shirts, denim skirts, jumpsuits | Light and mobile; reinforce pocket mouths and plackets, and expect a bigger strength loss after washing |
| 10–11 oz | 340–370 | Core women's jeans, straight and wide leg, denim skirts | The workhorse band, all seasons, and the easiest to wash consistently |
| 12–13 oz | 405–440 | Structured straight legs, denim jackets, sculpted shapes | Needs heavier needles and thread; the unwashed garment is stiff, so fit feedback misleads |
| 14–15 oz | 475–510 | Heavyweight vintage and raw programmes | Hard to wash evenly in small lots; heavy garment, heavier freight and labour |
The purchasing rule in one line: 10–11 oz for the core jean, 12–13 oz for jackets and structured legs, 8–9 oz only for shirts and skirts, and nothing above 14 oz for a first order. Get the weight wrong and the block, the wash and the price all have to be recalculated.
2. Washing: where cost and lead time actually live
The laundry is denim's second workshop. The same "medium blue, distressed" look built with enzyme, with stone or with laser gives three different levels of depth at three different costs (relative tiers below; confirm against your laundry's quote):
| Wash | What it does | Result | Cost / lead time | Risk |
|---|---|---|---|---|
| Rinse | Desizing, softening, setting | Clean dark indigo, slight fade | Lowest, fastest | Unstable shade gives obvious lot-to-lot variation |
| Enzyme | Biological polishing, removes surface hair | Soft hand, clean surface, subtle layering | Low to medium | Over-run loses strength — the crotch goes first |
| Stone | Pumice abrasion | Visible ageing, whitened edges | Medium | Grit residue, machine wear, uneven within a lot |
| Acid | Pumice plus oxidising agent | High contrast, mottled | Medium to high | Hardest to control; strength drops; effectively unreworkable |
| Laser | Positioned burn for whiskers, holes, fade graphics | Repeatable pattern, batch-consistent | Medium to high (setup cost) | Wrong parameters burn through or yellow the edge |
| Ozone | Gas-phase overall fading | Even lightening, low water | Medium | Sensitive to ground shade; depth control is experience-based |
| PP spray | Localised potassium permanganate oxidation | Whiskers, local highlights | Medium to high | Incomplete neutralising yellows later — the most common after-sales complaint in denim |
One thing to settle before ordering: give a wash reference, not an adjective. "Medium blue" or "lightly distressed" will produce four different results across two laundries. Supply a physical sample or a defined shade number, and require a wash swatch first — a denim wash trial needs its own drum run, and that step cannot be skipped.
3. Stretch: 1–3% elastane and the knee-bag problem
Most of the comfort in women's jeans comes from stretch, and stretch is the easiest thing to leave vague. The working tiers:
- Rigid. All cotton, holding shape through the block and the cloth's own body. Firm, durable, fades characteristically, but demands the best pattern work and creases when seated.
- Comfort stretch. 1–3% elastane — you can squat and sit, and it still looks like traditional denim. The mainstream choice in womenswear.
- High stretch. 3–5% elastane, or bicomponent polyester such as T400 for recovery. Close-fitting and leg-defining, but far more prone to growing — a day of wear and the knee and seat do not come back.
Growth is not mysterious; it is recovery rate and residual deformation. What belongs on the order is not "2% elastane" but three measurable items: elastic recovery, residual deformation after washing, and bagging under wear. Two further points get missed:
- Direction of stretch. Women's denim is usually weft stretch, so panels must be spread on grain. Spread on the bias to save cloth and the finished leg spirals — that, not the block, is why a leg looks twisted.
- Stretch versus wash. Stone and acid washes degrade elastane. On a heavily distressed stretch style, require recovery to be re-tested after washing, not on greige.
4. Five-pocket construction and denim jackets: the difference is in the details
What separates an expensive jean from a cheap one is structural:
- Waistband. Double-layer, fused, with a bound inside. Waistband ripple is the classic tell of a low-quality jean, and its cause is a mismatch in shrinkage between band and body.
- Fly. Zipper or button fly. A button fly reads more authentic and costs more labour; on a zip fly, confirm brand, length and whether the topstitch is double.
- Rivets and bar tacks. Pocket-corner rivets and bar tacks at stress points are what make jeans last. Confirm brass versus iron (iron rusts, and must be declared if goods pass a needle detector), and specify bar tack count by stress point rather than trimming it.
- Chain-stitch hem. The signature detail: after washing it forms the natural roping. Substitute a lockstitch and the jean reads fast fashion at a glance.
- Jackets are a different process. Yokes must be matched on the stripe, chest pocket mouths on grain, metal buttons declared for needle detection, and hem adjuster eyelets deburred. A jacket and jean in one range must be washed in the same drum with the same recipe, or they reach the shelf as two colours.
5. Fading, crocking and shrinkage: align expectations first
Indigo denim fades. That is a property, not a defect — but it becomes a complaint unless three things are agreed up front:
- How much it fades. Specify dry and wet rub fastness grades, not "doesn't fade much". Dark raw denim keeps releasing indigo over many wears; a light wash is essentially stable.
- Crocking. Dark denim against pale pocket linings, pale leather patches and pale thread needs a staining test. White bags and pale shoe uppers are the most common end-consumer complaint.
- Shrinkage. Un-sanforised denim moves noticeably (commonly 3–8%, highly dependent on weave and finishing); pre-shrunk greige far less. Always inspect the washed garment, never the greige.
A trap you can remove early: denim only reaches its final dimensions after washing, so a pre-production sample that measures correctly is not proof the bulk will. Require a pre-production sample measured after wash, and write the post-wash waist, hip and inseam into the approval sheet. Settle those three numbers and you have settled the return rate.
6. MOQ: how 50 pieces actually works
Back to the opening question. A low denim minimum stands or falls on three things lining up:
- Sharing a wash drum. Wash machines are rated by kilo, and a few dozen pairs can make a load — but only if colour and wash are identical. So the cheapest first order is one style in two colours with a single wash recipe, not one style in five colours across three washes.
- Fabric minimums. Denim greige is sold by the roll; a few dozen pieces will not consume a roll, and the balance becomes your inventory cost. Price that in rather than looking only at the make-up charge.
- The sampling route. Denim usually needs two rounds — a greige sample to settle block and construction, then a wash sample to settle colour and hand. That is the basis on which we start from about 50 pieces per style, with first samples in about 3–5 days and bulk in about 10–20 days (laundry queues in peak season are additional).
If the first order really is small, the pragmatic route is one or two colours and a rinse or enzyme wash only: prove the block and the size run on the simplest recipe, then add distressing on the reorder. Doing the opposite — five colours and three washes on an unproven block — is the fastest way to lose money in this category. The cost logic is set out in the hidden costs of small runs.
7. Responsible washing: what European buyers will ask about
European buyers increasingly write process restrictions into the enquiry itself. The practical items:
- No sandblasting. Many buyers will not accept hand sandblasting; laser or ozone takes its place. Confirm this at quotation, or the wash plan gets rebuilt.
- Low-water processes. Positioned laser plus ozone fading replaces part of the water load of stone and acid washing — and gives better batch consistency. That is a colour-control tool as much as an environmental one.
- Recycled cotton and polyester. Askable, but lock the transaction-certificate chain and expect more shade variation between lots — recycled yarn varies more, and dark washes show lot differences first.
- Effluent and chemistry. Permanganate and hypochlorite use and neutralising need records. That is not in your contract, but it is in your customer's factory audit.
8. Eight acceptance items you can put in the order
- Weight and composition, sampled per lot; elastane content tested separately on stretch styles.
- Post-wash dimensions at waist, hip and inseam, measured on the washed garment with fixed tolerances.
- Colour against the grey card per lot; jacket and jean in one range must come from the same drum.
- Wash consistency, three to five pieces compared per lot for shade and distress placement — "broadly similar" is not acceptance.
- Elastic recovery re-tested after washing, including a knee-bag check.
- Colour fastness — dry rub, wet rub, staining; staining is mandatory on dark shades.
- Stress points — rivets and bar tacks present, positioned and holding under pull.
- Trims and labels — metal parts declared for needle detection; main, size, care and origin labels complete, with correct care instructions for denim.
Where Liuyu fits: a womenswear development and production factory in Guangzhou, founded in 2014, having served 307 customers across 59 countries with 80+ in-house pattern and production staff, working in both knits and wovens, with denim scheduled together with its wash partner. We write the wash plan into the sampling approval alongside consumption: greige sample for block and construction, wash sample for colour and hand, with staining tests on dark shades and post-wash recovery on stretch styles reported together. From about 50 pieces per style, first samples in about 3–5 days, bulk in about 10–20 days (laundry queue additional in peak season).
Denim is not hard to sew. The work is translating "medium blue, comfortable, doesn't fade" into weight, elastane content, a wash recipe and post-wash numbers. Settle those four at the wash-swatch stage and the reorder conversation is about quantity and delivery only.
Frequently asked
- What is the MOQ for jeans made in China — can we start with 50 pieces per style?
- About 50 pieces per style is workable, on one condition: colour and wash recipe stay identical across the style, otherwise the number of wash drums doubles and the unit price with it. Two things really set a denim minimum — the wash drum (rated by kilo, and only same-colour, same-recipe styles can share a load) and greige sold by the roll (a few dozen pieces will not consume a roll, and the balance is cost). For a first order, run one style in two colours on a rinse or enzyme wash, prove block and sizing, then add distressing on the reorder. First samples in about 3–5 days, bulk in about 10–20 days, with laundry queue additional in peak season.
- Why do denim quotes vary so much, and how much of it is washing?
- Roughly half the quote is fabric and sewing, half is washing — which is why the same jean can legitimately cost very different amounts. The spread comes from the wash combination: rinse is cheapest and fastest, enzyme and stone sit in the middle, laser, acid and PP spray cost more and need their own setup or drum run. Three costs get overlooked: greige balance (sold by the roll), wash rework (acid is effectively unreworkable), and the labour of positioning distress by hand. To cut cost, simplify the wash before squeezing the make-up charge.
- How much elastane should stretch denim have, and will it bag out with wear?
- Comfort stretch in women's jeans is 1–3% elastane; high stretch is 3–5%, or bicomponent polyester such as T400 for recovery. Bagging is a failure of recovery rate and residual deformation, not simply too little elastane: what belongs in the order is elastic recovery, post-wash residual deformation, and a knee-bag test. Stone and acid washes also degrade elastane, so a heavily distressed stretch style must be re-tested after washing rather than on greige.
- If a jacket and jeans are made in the same batch, will the colour match?
- Yes — but only from the same drum with the same recipe. Even on identical greige, a different recipe, load size or cycle time shifts the shade by a full step, and the two pieces read as separate lots on shelf. Schedule jacket and jean into the same drum, or lock the drum number and recipe on the approval sheet; on reorder, run the archived recipe and compare a wash swatch before bulk, rather than going straight to production.
- Our European customer wants no sandblasting and less water — how do we achieve that?
- Three practical substitutions: laser for positioned whiskers and holes (repeatable and batch-consistent), ozone for overall fading (low water, even), and enzyme to replace part of the stone load (softer hand, lower effluent load). Confirm the sandblasting exclusion at quotation, or the wash plan has to be rebuilt. Keep records of permanganate and hypochlorite use and neutralising — factory audits ask for them. With recycled cotton or polyester, lock the transaction-certificate chain and expect more shade variation between lots than conventional yarn.