Supply-chain control in fashion: knowing who made a garment, tier by tier
Controlling the supply chain of a garment means knowing who made it at every step — making-up, weaving, dyeing, spinning, fibre — and holding, for each step, a document that proves it. Almost every brand knows its first tier. Beyond the first, the information stays with the supplier that bought the step before.
Edoardo Rinaldi · Founder, Trama
Last updated: 21 September 2026
What controlling a supply chain means
A fashion supply chain is read from the finished garment back to the origin. Each step is a tier, counted as its distance from the garment:
- Tier 1 — making-up: whoever cuts, sews and finishes the garment.
- Tier 2 — the fabric: weaving or knitting, dyeing, finishing, printing.
- Tier 3 — the yarn: spinning.
- Tier 4 — the fibre: farming, animal husbandry, production of the synthetic or recycled fibre.
Control has three parts, and missing one is enough to make it unusable. The names: which company and which site, with its country. The relationships: who sells to whom, for which product. The evidence: certificates, transport documents, laboratory tests, each with its expiry date.
A supplier list without relationships says who works with the brand, not who made a given garment. A relationship without evidence is a statement nobody can check.
Why control stops at the first tier
A brand buys the garment from the maker. The maker buys the fabric; the mill buys the yarn. The relationship with tier 2 belongs to tier 1, and the brand knows it only if tier 1 declares it.
The information already exists, scattered across the documents that travel with every order: order confirmations, transport documents, fabric specifications, transaction certificates. The work of control is bringing it back up the chain, one tier at a time, tied to the product it describes.
Which supply-chain data is needed, and why now
Four EU instruments ask whoever sells fashion in Europe for supply-chain data. Two bind now or within months; two arrive later, and the work of answering them is the same.
- From 27 September 2026, Directive (EU) 2024/825 bans generic environmental claims and sustainability labels that are neither certified nor set by a public authority. A garment presented as "responsible" has to be able to prove it.
- From 30 December 2026, Regulation (EU) 2023/1115 on deforestation asks, for bovine leather, for the reference of the due-diligence statement filed by the tannery; from 30 June 2027 for micro and small undertakings.
- From 14 December 2027, Regulation (EU) 2024/3015 prohibits placing products made with forced labour on the market. Answering an authority that investigates means knowing where a product was made.
- The Digital Product Passport under Regulation (EU) 2024/1781: for textiles the delegated act is expected in 2027. The proposal asks for the manufacturer and the facility at production-batch level.
The passport in fashion is therefore the visible part of a larger piece of work: the data it carries is supply-chain data, and it comes from suppliers. The passport in fashion and textiles and which data it will contain.
How control is built, in practice
The method that holds up over time starts from the product, not from the supplier list.
- Pick one product, and start from the maker that produces it.
- Ask the maker to name its own suppliers for that product: main fabric, lining, trims.
- Collect the documents that already exist rather than sending questionnaires: the transaction certificate, the fabric specification, the transport document.
- Ask every named supplier the same thing, one tier further up.
- Keep each certificate’s expiry date, and ask again only for what has expired or is missing.
- Mark where the chain stops. The point where nobody has answered yet is the next request.
The most common mistakes
The first is mistaking a site certificate for evidence about the product. A GOTS or GRS certificate says a company may handle certified material; that a given batch is certified is proved by the transaction certificate issued for that shipment.
The second is sending everyone the same questionnaire. A dye house and a spinning mill do not hold the same data, and a form that asks everyone for everything is filled in badly or not at all.
The third is keeping the supplier list apart from the products. The day an authority or a customer asks who made a garment, a list of companies does not answer the question.
How Trama does it
The supplier receives a link by email and answers with no password and nothing to install, one request per screen. It can name its own suppliers, who receive the next request in its name. Uploaded documents are read automatically, and a datum enters the product record only once a person has confirmed it.
Tiers are calculated from the declared relationships, and the point where the chain stops stays visible on the map. Trace the supply chain, from garment to fibre and supplier collection.
Frequently asked questions
What does supply-chain control mean in fashion?
Knowing who made a garment at every step — making-up, fabric, yarn, fibre — with the site and the country, and holding for each step a document that proves it.
Which supply-chain data does a garment passport need?
The textile proposal asks, among other things, for the manufacturer and the facility at production-batch level, the fibre composition and the certifications that prove what the passport states. The final list will be set by the delegated act expected in 2027.
How far up the supply chain does a brand have to go?
It depends on the datum. Fibre origin sits at tier 4; the making-up site at tier 1. The tier to reach is the one where the requested datum originates.
Does a supplier’s GOTS certificate prove a garment is organic?
No. The scope certificate says the company is authorised to handle certified material. A specific batch needs the transaction certificate issued for that shipment.
Do suppliers have to register on a platform?
Not with Trama. The supplier receives a link by email, answers with no password, and can also answer by email alone.