Scope 3 and supplier product footprints: why your buyer needs yours

Scope 3, category 1 in one paragraph

A company footprint has three scopes: its own fuel (Scope 1), the electricity it buys (Scope 2), and everything else in its value chain (Scope 3). Category 1 of Scope 3 covers the goods and services it buys. For a fashion brand, that is mostly the garments, fabrics and trims made by its suppliers.

How brands estimate it today

• Spend-based: what was spent with a supplier, multiplied by an industry average per currency unit. Quick, but blind to how a supplier makes things.
• Average-data: how much was bought by weight, multiplied by an average factor for the material.
• Supplier-specific: the supplier's own product footprint for each item bought. The most precise, and the only one that shows a supplier's improvements.

Why this is good news for suppliers

With spend-based figures, a factory that cuts its energy use looks the same as one that does not. With supplier-specific figures, the brand sees the difference, and the supplier's footprint becomes part of how the brand chooses who to buy from.

That is why requests arrive asking for a figure per product, often cradle to gate and often in the PACT data format.

From product footprints to the brand's total

A brand multiplies each supplier's product footprint by the quantity it bought and adds the results. With supplier-specific figures, the brand's category 1 total reflects how each supplier actually makes its products, and changes when suppliers improve.

That is also why consistency matters: footprints with the same boundary and method can be added up; mixed ones cannot.

Questions to ask your customer

• Which products and which unit do you need?
• Do you need cradle to gate, and in the PACT format?
• Which data year should the footprint describe?
• Do you have a template or portal, and a deadline?

Scope 3 supplier data in practice: a walkthrough in words

Picture a brand that buys knitted tops from you and trousers from another factory. Last year it estimated its purchased goods from spend. Your factory and the other one looked alike, because the brand spent similar sums with each, even though you run on cleaner electricity and waste less fabric.

This year the brand asks both suppliers for a cradle-to-gate product carbon footprint per item. You send a footprint per top, with its unit, data year and sources. The brand multiplies it by the number of tops it bought and puts the result in its Scope 3 inventory in place of the spend-based estimate.

Two things change for you. First, the brand's figure for your tops now reflects how you make them. Second, when you cut energy or switch to a lower-impact yarn and update your footprint, the brand's total falls too. Your improvement becomes visible in its report, which is exactly what a buyer comparing suppliers wants to see.

It also changes the conversation. Instead of being one line in a spend report, you become a supplier with a figure the brand can track over time. That gives you something concrete to discuss at review meetings, alongside price, quality and lead time.

Common misunderstandings about Scope 3 supplier data

• "My company footprint is enough." A brand needs a figure per product it buys. A company total does not say how much of it belongs to each item.
• "Scope 3 is the brand's problem, not mine." The brand reports it, but the most precise data sits with you. Without it, the brand falls back on averages that cannot show your strengths.
• "A lower number is always better to send." A figure that leaves out stages or hides its assumptions will not stand up when the buyer checks it. Completeness and clear sources matter more than a small result.
• "Supplier-specific means every input must be my own data." It means the footprint is for your product. It can still combine your own energy and material data with published factors for upstream steps, as long as the mix is stated.
• "Once sent, the figure is fixed." Footprints describe a data year. Updating them when your processes change keeps the brand's inventory current.

What Scope 3 supplier data means for apparel, footwear and packaging suppliers

Apparel makers are often asked for footprints per garment style. The bill of materials, the fabric weight and the energy used in cutting, sewing and finishing are the core inputs. If you buy fabric rather than make it, ask your mill for its own data, as that is where much of the footprint sits.

Footwear makers deal with many components: uppers, linings, soles, adhesives and boxes. Brands usually want a figure per pair. A clear list of components with their materials and weights is the starting point, and assembly energy can be shared between styles using a stated allocation basis.

Packaging makers sell into many sectors, and their footprint becomes part of every customer's purchased goods. The unit matters most here: per item, per thousand items or per kilogram. Agree it with the buyer first, so your figure slots straight into their Scope 3 calculation.

Whatever you make, you can start with a free estimate and add your own data where it changes the answer.

What to give your buyer

A cradle-to-gate footprint per product, with its unit, its data year, its primary data share and the sources used, plus a PACT file for their system. Our guide to answering a request walks through it, and you can start from your product list.

Questions