Process Loss Margins: Cutting Wastage, Printing & Laundry
Lesson Contents Overview
Learning Objectives
Comprehensive Technical GuidanceTextbook & Training SOP
Process Loss Margins: Cutting Wastage, Printing & Laundry
1. What a Process Loss Margin Actually Is
Every garment process loses something. Cutting loses fabric to end bits and marker gaps. Printing rejects panels with misprints and shade faults. Washing shrinks fabric. Rolls end before the marker does. A fabric booking that ignores these losses runs short mid-order, and a booking that guesses them as one blanket percent either overbooks and ties up cash, or underbooks and stops the line.
A process loss margin is the extra quantity booked to cover one specific loss, applied to the quantity that actually passes through that process. That last phrase is the whole discipline. Cutting touches every garment, so cutting wastage applies to the full order. Printing touches only printed pieces, so printing loss applies only to printed pieces. Laundry touches only washed pieces, so shrinkage applies only to washed pieces. A margin applied to the wrong quantity base is not a safety buffer; it is an error with a confident name.
The natural search phrase for this skill is process loss margin, and the question it answers is practical: how much fabric do we actually book for this order, and can every metre be explained?
2. Cutting Wastage
Cutting wastage is the fabric lost between the booked roll and the finished cut panel. Its sources are end bits at roll starts and ends, selvedge trim, small gaps inside the marker that no pattern piece can fill, and spreading losses where plies shift or relax. In illustrative planning, cutting wastage for plain fabrics sits around 5 to 8 percent, higher for checked or striped fabrics that need pattern matching, and higher again for stretch knits that relax and curl during spreading.
Cutting wastage is applied first, to the full order quantity, because it converts net consumption into gross consumption per garment. Once gross consumption is fixed, later layers use it as their unit: an extra printed panel costs gross consumption metres, not net, because the replacement panel must itself be cut.
3. Printing and Embroidery Loss
Printing loss is the extra panels needed because some printed panels are rejected: misregistration, dye migration, pinholes, shade bands, or handling damage. The rejection rate is measured on printed pieces only. If 6,000 pieces of a 10,000-piece order are printed and the print rejection rate is 2 percent, the extra panels are 6,000 times 0.02, which is 120 panels. Those 120 panels need fabric: 120 times gross consumption per garment.
Embroidery follows the same logic at a lower typical rate, around 1 to 3 percent in illustrative planning, because embroidery rejects come from thread breaks, needle cuts, and design distortion rather than chemistry. The key control is the same: measure rejects per process, on that process's quantity, and book exactly that.
A subtle point: printed panels are usually cut before printing, so the printing loss is extra panels, not extra garments. The replacement panels come from the same booked fabric, which is why printing loss appears in the fabric booking at all. If panels were printed before cutting, the loss would sit in a different place, but the arithmetic would still be panels times gross consumption.
4. Washing, Shrinkage, and Laundry Loss
Washing changes fabric dimensions. Cotton and cotton-rich fabrics contract in length and width during wet processing, and a garment cut to the pre-wash pattern comes out smaller than the tech pack requires. The shrinkage allowance compensates by booking extra fabric length, so that after washing the garment measures correctly.
The allowance applies only to washed pieces. For 5,000 washed T-shirts at gross consumption 0.7632 metres, the washed fabric is 5,000 times 0.7632, which is 3,816 metres. With a 3 percent shrinkage allowance, the booked length is 3,816 times 1.03, which is 3,930.48 metres, an extra 114.48 metres. Applying that 3 percent to the whole 10,000-piece order would book an extra 229 metres instead of 114.48, overbooking by more than 114 metres on garments that were never washed.
Laundry also rejects pieces: broken seams, colour bleeding, and wash damage. Where a factory measures a laundry rejection rate, it is booked the same way as printing loss, on washed pieces only, as extra panels. Keep shrinkage and rejection as separate lines: they have different causes, different rates, and different corrective actions.
5. Worked Example: Full Booking Build-Up for 10,000 T-Shirts (Illustrative Figures)
An order of 10,000 T-shirts has net fabric consumption of 0.72 metres per garment. All percents below are illustrative example values.
Net fabric is 10,000 times 0.72, which is 7,200 metres. Cutting wastage of 6 percent gives 7,200 times 1.06, which is 7,632 metres, and gross consumption per garment is 0.72 times 1.06, which is 0.7632 metres.
Printing: 6,000 pieces are printed, with a 2 percent print rejection rate. Extra panels are 6,000 times 0.02, which is 120 panels. Extra fabric is 120 times 0.7632, which is 91.58 metres.
Laundry: 5,000 pieces are washed. Washed fabric is 5,000 times 0.7632, which is 3,816 metres. With a 3 percent shrinkage allowance, booked washed fabric is 3,816 times 1.03, which is 3,930.48 metres, an extra 114.48 metres.
Subtotal is 7,632 plus 91.58 plus 114.48, which is 7,838.06 metres. End loss of 0.5 percent gives 7,838.06 times 1.005, which is 7,877.25 metres to book.
Compare that with the blanket approach: net 7,200 metres plus a flat 10 percent is 7,920 metres. The blanket figure is higher than the layered figure here, yet it still failed the factory in the case study below, because a single percent cannot distinguish a printing problem from a shrinkage problem, and it gives no clue where the next correction belongs.
6. The Compounding Trap and Margin Governance
Margins compound. A garment passing through 6 percent cutting, 2 percent printing, and 3 percent laundry does not carry 11 percent total loss. Compounded, 1.06 times 1.02 times 1.03 is 1.113636, which is 11.36 percent. On a single garment at 0.72 metres net, the compounded gross is 0.72 times 1.113636, which is 0.801818 metres, while the flat 11 percent figure gives 0.72 times 1.11, which is 0.7992 metres. The difference is 0.002618 metres per garment, which is 26.18 metres on 10,000 pieces. Small per garment, real per order, and exactly the kind of gap that leaves cutting short on the last hundred pieces.
Margin governance closes the loop. After each order, reconcile: booked metres minus cut metres minus recorded waste should equal leftover metres in the store. If the reconciliation shows a gap, one of the margins was wrong, and the next booking should carry the measured figure, not last season's sheet. Factories that reconcile improve their margins every season. Factories that do not repeat the same booking error on every order, and call the resulting shortage bad luck.
7. Measuring Your Own Margins: Three Orders to a Factory Standard
Illustrative ranges are starting points, not factory standards. Your factory's true margins come from measurement, and three consecutive orders are enough to set them. For each order, record four numbers per process: quantity in, quantity out good, quantity rejected, and waste weight or length. Cutting wastage is booked metres minus cut-panel metres, divided by booked metres. Print rejection is rejected panels divided by printed panels. Shrinkage is pre-wash length minus post-wash length, divided by pre-wash length, measured on a marked sample length, not estimated from the finished garment.
Average the three orders, then set the booking margin slightly above the average, not at the maximum. A margin set at the worst single order overbooks every future order; a margin set at the average with a small buffer covers normal variation without padding. Review the margins quarterly and after any process change: a new spreading machine, a new print supplier, or a new wash recipe all reset the measurement, and the booking must follow the measurement, not last year's sheet.
Factories that measure their margins stop arguing about them. The booking sheet shows measured rates, the store reconciliation confirms them, and the conversation moves from whose guess is right to what the next improvement should be.
1. Layered Fabric Booking: 10,000 T-Shirts (Illustrative Figures)
| Layer | Quantity Base | Calculation | Metres |
|---|---|---|---|
| Net fabric requirement | 10,000 pcs | 10,000 times 0.72 | 7,200.00 |
| After cutting wastage 6% | Full order | 7,200 times 1.06 | 7,632.00 |
| Printing extra (2% of 6,000 printed) | 120 panels | 120 times 0.7632 | 91.58 |
| Laundry extra (3% of 5,000 washed) | 3,816 m washed | 3,816 times 1.03 minus 3,816 | 114.48 |
| Subtotal | 7,632 plus 91.58 plus 114.48 | 7,838.06 | |
| End loss 0.5% | Subtotal | 7,838.06 times 1.005 | 7,877.25 |
| Final fabric to book | 7,877.25 |
2. Typical Process Loss Planning Ranges (Illustrative Figures)
| Process | Planning Range | Applies To |
|---|---|---|
| Cutting wastage | 5% - 8% | Full order quantity |
| Printing rejection | 2% - 4% | Printed pieces only |
| Embroidery rejection | 1% - 3% | Embroidered pieces only |
| Washing shrinkage allowance | 2% - 5% | Washed pieces only |
| Roll end loss | 0.5% - 1% | Booked total |
Practical Commercial Flow
An order of 10,000 T-shirts has net fabric consumption of 0.72 metres per garment, so net fabric is 10,000 times 0.72, which is 7,200 metres. Cutting wastage of 6 percent gives 7,200 times 1.06, which is 7,632 metres. Printing: 6,000 pieces are printed, with a 2 percent print rejection rate, so 6,000 times 0.02 is 120 extra panels, and 120 times 0.7632 metres is 91.58 metres of extra fabric. Laundry: 5,000 pieces are washed, using 5,000 times 0.7632, which is 3,816 metres, with a 3 percent shrinkage allowance, giving 3,816 times 1.03, which is 3,930.48 metres, an extra 114.48 metres. Subtotal is 7,632 plus 91.58 plus 114.48, which is 7,838.06 metres. End loss of 0.5 percent gives 7,838.06 times 1.005, which is 7,877.25 metres to book. All percents and consumptions are illustrative example values.
Factory Real-Life Scenario
Scenario: A Dhaka knitwear factory booked fabric for a 20,000-piece washed and printed T-shirt order using one blanket margin of 10 percent over net consumption. Cutting finished on plan, but printing rejected more panels than expected and the washed fabric shrank beyond the allowance, leaving the factory 400 pieces short of fabric with the shipment date fixed.
Solution: The merchandiser bought 350 metres of greige fabric at spot price and rushed it through dyeing, while the IE manager rebuilt the booking in layers: cutting on the full quantity, printing loss only on printed pieces, shrinkage only on washed pieces, and end loss last. The layered booking for the repeat order covered cutting, printing, and washing with fabric to spare on every process.
Impact: The spot purchase and express dyeing cost more than the layered margin would have, and the shipment still left two days late. The factory now books every order in layers, and no order has run short of fabric since.
Commercial Officer Best Practice
Reconcile the booking after cutting: booked metres minus cut metres minus recorded waste should equal leftover metres in the store. A reconciliation gap means a margin was wrong, and the next booking should carry the corrected figure.
Top Beginner Mistakes to Avoid
- Applying a process loss to the whole order when only part of the order passes through that process.
- Adding flat percents (6 plus 2 plus 3 equals 11) instead of compounding them layer by layer (11.36 percent).
- Counting cutting wastage twice: once in gross consumption and again as a booking margin.
- Forgetting end loss on roll fabric, then discovering the last roll ends mid-marker.
- Copying last season's margins after a process change, such as switching from manual to auto spreading or adding a wash.
Important Commercial & Trade Terminology (5 Terms)
Fabric lost during spreading and cutting: end bits, selvedge, and marker gaps.
💡 Note: Applied to the full order quantity, since every garment is cut.Extra panels or garments needed because a process rejects some pieces, such as printing or embroidery.
💡 Note: Applied only to the quantity passing through that process.Extra fabric length booked to compensate for contraction during washing or finishing.
💡 Note: Applied only to washed or finished pieces, never to the whole order.Short unusable lengths at the start and end of fabric rolls.
💡 Note: Applied last, to the booked total, at around 0.5 percent in illustrative planning.Applying successive percents to growing totals rather than adding them flat.
💡 Note: 6 percent, then 2 percent, then 3 percent compounds to 11.36 percent, not 11 percent.Interview Preparation Questions & Answers (4 Questions)
Master these high-frequency interview questions for Commercial Officer, Merchandising, and Export Executive roles.
Net fabric is 10,000 times 0.72, which is 7,200 metres. After cutting it is 7,200 times 1.06, which is 7,632 metres.
Frequently Asked Questions (4 FAQs)
Clear, beginner-friendly answers to the most common questions about the Commercial Department.
Key Takeaways & Summary Points
Executive Lesson Summary
Process loss margins are booking layers, not a single blanket percent. Cutting wastage applies to the full quantity, printing loss only to printed pieces, shrinkage only to washed pieces, and end loss to the booked total. Built layer by layer and compounded correctly, the booking covers real losses without padding, and reconciling it after production keeps every future booking more accurate.