Fiber to Carton: What Full Lot Lineage Takes
"Where did this garment come from?" used to be a marketing question with a marketing answer. It is becoming a regulatory question with a documentary answer, and the difference is total: marketing accepts a story, regulation demands a chain of records that reconnects a carton of finished goods to the fibers it began as.
The chain, named
For a knit garment from a composite mill, the full lineage runs: fiber lots received, yarn lots spun or purchased, knitting programs consuming yarn lots into greige lots, dye batches consuming greige into finished fabric lots, rolls issued to cutting against a cut plan, bundles cut from those rolls, sewn garments from those bundles, cartons packed from those garments. Eight links, and the chain is only as traceable as its weakest one.
Where chains actually break
Not where audits look. The breaks hide in the casual moments: a store issue recorded against "fabric" instead of a lot; a cutting lay fed from whichever rolls were nearest; a partial carton topped up from another order's overage; a subcontracted dye job that returns fabric with no linkage to what was sent. Each is a small convenience at the time. Each one severs the chain at that link, and no amount of downstream discipline can reattach it, which is why lot discipline is a habit, not a project.
The mechanics that hold
Three rules carry the whole structure. Every material movement is a document naming lots on both sides. Every transformation, knit, dye, cut, records which input lots became which output lot, the lineage edge written at the moment of the event. And identity survives splitting and merging: when a lot splits across two lays or two batches merge into one shipment, the record says so explicitly rather than averaging the difference away. Get those three right and traceability stops being an initiative; it is just what the records already say.
Why now
The Digital Product Passport timeline turns this from best practice into market access: passports will want composition, origin, and process facts per product, and those facts are only assertable if the chain behind them exists. The factories that will find compliance cheap are the ones whose stores already move nothing without a lot. Start with the readiness checklist; the honest first step is finding which of your eight links breaks today.