Garment Costing: How to Cost a Garment Accurately (and Where AI Helps)

Garment costing is the quietest way a factory loses money. A style costed a few rupees too low still wins the order — and then loses on every single piece, invisibly, until someone finally reconciles the job and wonders where the profit went. A style costed too high simply loses the order to a competitor who costed it better. Costing sits at the exact point where winning work and making money have to be balanced, and doing it accurately, quickly and repeatably is one of the most valuable capabilities a garment business can have. This guide covers how to cost a garment properly and where AI helps.

What goes into a garment's cost

A garment's cost is built up from several components. **Fabric** is usually the largest — consumption per garment (from the marker) times the fabric rate, including wastage. **Trims and accessories** — thread, buttons, zips, labels, elastic, packing — each small but adding up. **CMT (cut-make-trim)** — the labour and factory cost to actually make the garment, often derived from the SAM (standard allowed minutes) times a cost-per-minute. **Value-added processes** — printing, embroidery, washing, special finishes. **Overheads** — the factory costs not tied to one garment, apportioned. **Testing, compliance and logistics** where relevant. And finally **margin**. Miss or underestimate any component and the quoted price is wrong.

CMT vs FOB costing

Two costing models dominate, and they cover different things. In **CMT costing**, the buyer supplies the fabric and often trims, so the factory costs only its labour, overhead and a make margin — a simpler cost built around the CMT. In **FOB costing**, the factory buys the materials itself and quotes a full landed cost including fabric, trims, CMT, wastage, testing, freight to port and margin — a complete cost and a bigger commitment. Knowing which model an order uses is the first step, because they include different things and a confusion between them is a costing error waiting to happen.

Why manual costing goes wrong

Costing on a spreadsheet works until it doesn't, and it fails in predictable ways. Consumption is estimated rather than taken from the actual marker. Trim costs are out of date. The CMT is a round-number guess rather than a SAM-based figure. Overhead apportionment is crude. And crucially, the quoted cost is never checked against what the job actually cost, so the same estimating errors repeat order after order. The result is a factory that is confident in numbers that are quietly wrong.

How ERP makes costing accurate and fast

A garment ERP builds the cost from real data and closes the loop. Fabric consumption comes from the marker, trim costs from a live bill of materials and price list, CMT from the SAM, and overheads from a defined basis — so the estimate is built, not guessed. The same style can be costed in both CMT and FOB models. And after production, actual costs are reconciled against the quote, so the factory learns where its estimates drift and improves them. Contribution per style and per buyer becomes visible, so the business knows which work actually makes money. This is the financial management discipline built into the garment ERP and apparel ERP platform.

Where AI helps costing

AI's contribution to costing is practical and honest. Document AI reads a buyer's costing request, tech pack or BOM into the system so costing starts from clean, structured data instead of a re-keyed brief. On historical cost-versus-actual data, AI can flag where estimates systematically drift — the trim always underestimated, the wastage always optimistic — so the estimating improves. And AI can speed the repetitive work of building a cost sheet from a known style. It does not replace the costing team's judgement about margin and risk; it removes the manual data-wrangling and surfaces the patterns that make the next quote more accurate.

Garment costing is where a factory decides, before it makes anything, whether the order will make money — and doing it on stale spreadsheets is how profitable-looking factories quietly bleed. Costing from real consumption, trim and CMT data, in the right model, and checking it against actuals is the difference. If your costing is estimated and never reconciled, that gap is likely costing you on orders you think are profitable, and you can see how a style is costed and reconciled with your own numbers.