Itemized Fabric Cost Calculation: Shell, Lining & Pocketing
Lesson Contents Overview
Learning Objectives
Comprehensive Technical GuidanceTextbook & Training SOP
Itemized Fabric Cost Calculation: Shell, Lining & Pocketing
1. Why Itemized Fabric Costing Matters
Fabric is usually the largest single cost on a garment, often more than half the FOB price. Yet many factories cost it as one blended figure: a single consumption number and a single price carried over from a previous style. That shortcut survives only until something changes, and something always changes: a new lining construction, a narrower fabric width, a price revision from the mill.
Itemized fabric costing is the discipline of costing every fabric separately. Shell, lining, pocketing, interlining, and contrast fabric each get their own line on the bill of materials (BOM), with their own net consumption, their own wastage allowance, and their own price. The fabric cost per garment is then the sum of those lines. When a price moves, only one line moves. When a construction changes, only one line changes. When a buyer audits the quotation, every number shows its derivation.
The natural search phrase for this skill is fabric consumption calculation, and the question buyers and auditors ask is always the same: show me how you reached the fabric cost per garment. This lesson gives you a sheet that answers that question line by line.
2. The Fabric Cost Formula
The method has three steps, applied separately to every fabric component:
Step 1: Gross consumption equals net consumption times (1 + wastage percent / 100). Net consumption is the exact length the pattern pieces need for one garment, measured from the approved marker at a stated fabric width. Wastage is the extra fabric lost in cutting: end bits, selvedge trim, and small gaps the marker cannot use.
Step 2: Line cost equals gross consumption times price per metre. The price must be the current supplier price for that exact fabric, including any dyeing, printing, or finishing surcharge already agreed.
Step 3: Fabric cost per garment equals the sum of all line costs. Cost per dozen equals cost per garment times 12. Order fabric cost equals cost per garment times order quantity.
Two rounding rules keep the sheet honest. First, round only the final cost per garment, never the consumption in the middle of the calculation. Second, carry gross consumption to at least three decimals until the final multiplication, because a rounding of 0.01 metres on a 100,000-piece order is 1,000 metres of fabric.
3. Worked Example: Men's Casual Shirt (Illustrative Figures)
A men's casual shirt uses three fabrics. All prices and consumptions below are illustrative example values, chosen to make the arithmetic easy to follow.
Shell fabric: net consumption 1.60 metres per garment, cutting wastage 8 percent. Gross consumption is 1.60 times 1.08, which is 1.728 metres. At BDT 280 per metre, the shell line cost is 1.728 times 280, which is BDT 483.84 per garment.
Lining: net consumption 0.45 metres, wastage 5 percent. Gross consumption is 0.45 times 1.05, which is 0.4725 metres. At BDT 120 per metre, the lining line cost is 0.4725 times 120, which is BDT 56.70 per garment.
Pocketing: net consumption 0.30 metres, wastage 5 percent. Gross consumption is 0.30 times 1.05, which is 0.315 metres. At BDT 90 per metre, the pocketing line cost is 0.315 times 90, which is BDT 28.35 per garment.
Total fabric cost per garment is 483.84 plus 56.70 plus 28.35, which is BDT 568.89. Cost per dozen is 568.89 times 12, which is BDT 6,826.68. On a 40,000-piece order, total fabric cost is 568.89 times 40,000, which is BDT 22,755,600. Notice how the lining and pocketing together are only BDT 85.05 per garment, yet on 40,000 pieces they are BDT 3,402,000. Small lines are large money at scale, which is exactly why they must be itemized rather than guessed.
4. Worked Example: Knit T-Shirt and the Marker Efficiency Check
A basic knit T-shirt uses a single jersey fabric. Net consumption is 0.72 metres per garment, cutting wastage is 6 percent, so gross consumption is 0.72 times 1.06, which is 0.7632 metres. At BDT 340 per metre, fabric cost per garment is 0.7632 times 340, which is BDT 259.49 (259.488 before rounding). Per dozen it is 259.488 times 12, which is BDT 3,113.86.
Before booking, check the marker. Marker efficiency equals pattern area divided by total marker area. Suppose the marker covers 7.80 square metres and the pattern pieces cover 6.90 square metres. Efficiency is 6.90 divided by 7.80, which is 88.46 percent. That is a healthy figure for a T-shirt marker, and it supports the consumption figure. If efficiency came out at 78 percent on a plain T-shirt, the marker, the width assumption, or the consumption itself would need investigation before a single metre was booked. The marker check costs ten minutes and can save a whole fabric overbooking.
5. Shell, Lining, and Pocketing: What Belongs on Each Line
The shell line carries the main body fabric: the cloth the buyer sees. Its consumption comes from the full garment marker, and its wastage is usually the highest of the three because its pieces are large and shaped.
The lining line carries the fabric inside the garment: full linings, half linings, sleeve linings, and yoke linings. Lining width is often different from shell width, so its consumption must be measured separately. A full front lining roughly doubles the lining quantity of a half lining, which is why a construction change that looks minor on the tech pack can move the cost by several taka per garment.
The pocketing line carries pocket bags, pocket facing cloth, and inside pocket cloth. Pocketing is usually a cheaper cloth than the shell, so costing it at the shell price is a pure overstatement. It is also the line most often forgotten entirely, because pocket bags are not visible on the finished garment. A forgotten pocketing line is a loss on every piece, discovered only when the fabric store runs short mid-order.
6. Common Errors and the BOM Sign-Off Checklist
Five errors account for most fabric costing losses. Costing lining at the shell price inflates cost and loses orders. Applying wastage to price instead of quantity understates cost. Copying consumption across widths without recomputing misprices every booking. Omitting a small component loses money at scale. Rounding mid-calculation shifts order totals by thousands.
Before any fabric cost sheet reaches a quotation, run this checklist. Every fabric on the tech pack appears on the BOM exactly once. Every consumption states its fabric width. Every wastage percent is stated per component, not as one blanket figure. Every price is the current supplier price for that exact fabric. The sheet shows cost per garment, per dozen, and per order. And one manager has signed it. A sheet that passes these checks can be defended in front of any buyer, because every number on it shows its derivation.
7. Fabric Cost Sheet Template and Monthly Price Review
A fabric cost sheet earns its keep only if it stays current. Build one template per style with fixed columns: component, net consumption, fabric width, wastage percent, gross consumption, price per metre, and line cost, plus a totals row for cost per garment, per dozen, and per order. When a mill revises a price, only the price column changes, and the whole sheet re-prices without rework. When a pattern is revised, only the consumption column changes. This separation of quantity and price is what makes the sheet auditable month after month.
Review prices monthly, not seasonally. Mills revise dyeing surcharges, exchange rates move imported fabric prices, and a price that was right in January can be wrong by March. The review itself is short: compare every price on the sheet with the latest supplier confirmation, note any movement in one line beside the price, and re-sign the sheet. A sheet whose prices are three months old is not a costing document; it is a historical record, and quotations built on it will drift from reality in exactly the direction that loses money.
1. Worked Fabric Cost Sheet: Men's Casual Shirt (Illustrative Figures)
| Component | Net Consumption (m) | Wastage | Gross Consumption (m) | Price (BDT/m) | Line Cost (BDT) |
|---|---|---|---|---|---|
| Shell fabric | 1.60 | 8% | 1.728 | 280 | 483.84 |
| Lining | 0.45 | 5% | 0.4725 | 120 | 56.70 |
| Pocketing | 0.30 | 5% | 0.315 | 90 | 28.35 |
| Total fabric cost per garment | 568.89 | ||||
| Total fabric cost per dozen | 6,826.68 |
2. Typical Cutting Wastage Allowances by Fabric Type (Illustrative Planning Ranges)
| Fabric / Component | Planning Wastage Range | Why It Varies |
|---|---|---|
| Plain shell fabric, large pieces | 5% - 8% | Marker efficiency and pattern shape |
| Checked or striped shell fabric | 8% - 12% | Pattern matching across pieces |
| Lining | 4% - 6% | Small, regular pieces |
| Pocketing | 4% - 6% | Small, regular pieces |
| Stretch knit fabric | 6% - 10% | Relaxation and edge curl during spreading |
Practical Commercial Flow
A men's casual shirt uses three fabrics. Shell: net consumption 1.60 metres, cutting wastage 8 percent, so gross consumption is 1.60 times 1.08, which is 1.728 metres, at BDT 280 per metre, giving BDT 483.84. Lining: net consumption 0.45 metres, wastage 5 percent, so gross consumption is 0.45 times 1.05, which is 0.4725 metres, at BDT 120 per metre, giving BDT 56.70. Pocketing: net consumption 0.30 metres, wastage 5 percent, so gross consumption is 0.30 times 1.05, which is 0.315 metres, at BDT 90 per metre, giving BDT 28.35. Total fabric cost per garment is 483.84 plus 56.70 plus 28.35, which is BDT 568.89. Per dozen it is 568.89 times 12, which is BDT 6,826.68. All prices and consumptions are illustrative example values.
Factory Real-Life Scenario
Scenario: A Gazipur shirt factory quoted 40,000 casual shirts using a single blended fabric figure copied from a previous style. During production the lining actually used was 0.52 metres net per garment, not the 0.45 metres on the sheet, because the new style had a full front lining instead of a half lining.
Solution: The costing team rebuilt the BOM as three separate lines, measured the new lining from the actual pattern, and re-priced: lining gross consumption became 0.52 times 1.05, which is 0.546 metres, costing 0.546 times BDT 120, which is BDT 65.52 per garment instead of BDT 56.70, a difference of BDT 8.82 per garment.
Impact: The correction was worth 8.82 times 40,000, which is BDT 352,800 on the order. The factory absorbed the loss on the confirmed order but made itemized BOM lines mandatory for every new style, and no blended fabric figure has been quoted since.
Commercial Officer Best Practice
Keep one master fabric cost sheet per style with a column for net consumption, wastage percent, gross consumption, price, and line cost. When a price changes, only the price column moves, and the whole sheet re-prices cleanly.
Top Beginner Mistakes to Avoid
- Costing lining and pocketing at the shell fabric price, which inflates the garment cost and loses orders on price.
- Applying wastage to the price instead of the quantity, which understates cost whenever the price is high.
- Copying consumption across fabric widths without recomputing, so a 150 cm consumption silently misprices a 140 cm booking.
- Leaving interlining or contrast fabric off the BOM because it looks small per garment.
- Rounding consumption to two decimals mid-calculation, which shifts the order total by thousands on large quantities.
Important Commercial & Trade Terminology (5 Terms)
The exact fabric length required by the pattern pieces for one garment, with no allowance for cutting waste.
💡 Note: Measured from the marker or pattern; always state the fabric width beside it.Net consumption plus the cutting wastage allowance: gross equals net times (1 + wastage percent / 100).
💡 Note: This is the quantity actually booked and paid for.Fabric lost between the marker and finished cut pieces: end bits, selvedge trim, and small unusable gaps.
💡 Note: Tracked separately from sewing defects and print loss.Pattern area divided by total marker area, expressed as a percentage.
💡 Note: Low efficiency warns that consumption may be overstated.The complete itemized list of every material on a garment with quantity and cost per garment.
💡 Note: The BOM is the costing document buyers audit first.Interview Preparation Questions & Answers (4 Questions)
Master these high-frequency interview questions for Commercial Officer, Merchandising, and Export Executive roles.
Multiply net consumption by (1 + wastage percent / 100). For example, 1.60 metres net with 8 percent wastage gives 1.60 times 1.08, which is 1.728 metres gross.
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
Itemized fabric costing means treating shell, lining, and pocketing as separate cost lines, each with its own net consumption, wastage allowance, and price. Gross consumption equals net consumption times (1 + wastage percent / 100), line cost equals gross consumption times price, and fabric cost per garment is the sum of the lines. Done this way, the fabric cost sheet is auditable, re-priceable, and defensible in front of any buyer.