The 'Eco' T-Shirt: A Claim the Evidence Cannot Carry
You are the product developer for a small Maltese online retailer planning 3,000 unisex T-shirts for a summer capsule. The retail price is fixed at €19.90 and the gross margin target is 62%, leaving a maximum fabric cost of about €1.30 per T-shirt. Suppliers offer four jerseys at 160 g/m²: (A) conventional cotton, €1.10; (B) cotton described as organic, €1.45, 'certificate available on request'; (C) recycled polyester from post-consumer bottles, €1.25, with a GRS transaction certificate and a 3,000-unit minimum; (D) bamboo viscose, €1.60, which the agent calls 'naturally sustainable and antibacterial'. Lead time from order to delivery is ten weeks for A, B and D, and twelve weeks for C; the launch date cannot move. The marketing team has already drafted a hangtag: '100% eco-friendly. Made from sustainable bamboo.' The customers are 20–35, live in a hot, humid climate and will wash the T-shirt after every wear.
1. Assess the four options against the evidence you actually have and the performance needed. Say which claims you could defend and which you could not.
Read the worked answer
A - conventional cotton. No environmental claim is available. It is the cheapest, breathable and comfortable in heat, but conventional cotton carries a heavy irrigation and pesticide burden. Defensible claim: none beyond fibre content and durability if tested.
B - 'organic' cotton. An organic claim needs third-party certification: a scope certificate from the processor plus transaction certificates covering your batch (GOTS or OCS). 'Certificate available on request' means no evidence in hand, so the claim is unsubstantiated until the paperwork arrives. If the certificates appear and the cotton is genuinely organic, the claim is defensible - organic standards restrict synthetic pesticides and require traceability, though they do not make cotton low-water.
C - recycled polyester, GRS. GRS is a recognised standard for recycled content with chain of custody; a transaction certificate ties the specific shipment to the certified material. 'Made with recycled polyester' is defensible if the TC covers the batch. Be honest about limits: it is still plastic, it still sheds microfibres in the wash, and bottle-to-fibre is usually downcycling rather than a closed loop. Performance in a hot, humid climate is weaker: less breathable and more odour-retentive than cotton.
D - bamboo viscose. Two problems. First, the legal fibre name is 'viscose', not 'bamboo' - the plant is bamboo, the processed fibre is viscose, and EU textile labelling rules require the fibre name. Second, 'antibacterial' is a health-related claim that requires evidence of a durable effect, which a plain viscose jersey does not have. The viscose process is also energy- and chemical-intensive. Least defensible of the four.
2. Decide what you would order, allowing for the fabric ceiling and the launch date, and justify any compromise you accept.
Read the worked answer
Screen the options against the two hard constraints first:
- Fabric ceiling €1.30: A (€1.10) and C (€1.25) pass; B (€1.45) is €0.15 over, which is €450 across 3,000 units; D (€1.60) is over and its claims fail anyway.
- Ten-week launch: C needs twelve weeks, so it fails on time unless the launch moves or stock is air-freighted - and air freight would undermine any environmental positioning.
So the honest shortlist is A (no claim) or B (claim, if certified and if the price moves).
Decision: negotiate B to €1.30 or below, conditional on a GOTS scope certificate and transaction certificate arriving before the order is placed; if the supplier cannot produce certificates or cannot move on price, take B anyway only after weighing a 0.75-point margin reduction (€450 total) against the value of a substantiated claim - or drop to A and remove the environmental claim from the campaign entirely.
Compromises I would state openly:
- A margin reduction is preferable to an unsubstantiated claim, because a banned or challenged claim costs far more than €450 in reputational and legal exposure.
- Choosing cotton over recycled polyester is a comfort decision for a hot, humid market as much as an environmental one; I would say so rather than pretend polyester is better for the wearer.
- D is rejected on cost, time and evidence.
- 'Made to last' style durability language should only be used if I have wash-test data to back it.
Dropped: C on lead time; D entirely. The order is B if certified, A as the fallback.
3. Rewrite the hangtag claim so that it would survive scrutiny, and list the documentation you would hold on file and the fibre information that must appear on the label.
Read the worked answer
Why the draft fails: 'eco-friendly' is a generic environmental claim with no defined meaning or threshold, and 'sustainable bamboo' compounds two faults - an unsubstantiated adjective and the wrong fibre name. Under EU consumer-protection rules on green claims (including the Empowering Consumers Directive, with member-state application from 2026), generic claims must be substantiated or dropped, and specific claims need evidence.
Defensible rewrite (if B is certified):
- Front: 'Made with 100% GOTS-certified organic cotton. Licence no. XXXXX.'
- Back, small print: 'Certified organic cotton, chain of custody verified. Wash cool, line dry, and wear it for years.'
- If B is not certified, the tag says only: '100% cotton. Machine wash 30 °C.' No environmental adjective at all.
Documentation on file:
- GOTS or OCS scope certificate for the fabric supplier; transaction certificates for each shipment, matched to our order reference.
- Test reports for shrinkage and colour fastness, so durability claims are evidenced.
- Supplier declarations for any dye or finish claim.
- Copies of the final artwork and label text, dated, so the approved wording is traceable.
- A record of what was rejected and why, in case of a challenge.
Mandatory label information: fibre composition by percentage using the legal fibre names (e.g. '100% cotton', '100% viscose' - never 'bamboo' as the fibre); care instructions using the standard wash symbols; and the certification logo only where the licence permits it. Composition is a legal requirement; care symbols are not harmonised as mandatory across the EU but are expected by customers and should match the tested performance.