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Does every sustainable fabric listing mean the same cloth?
No. Sustainable fabric is a claim, not a single fibre. The useful page names the issue: fibre, chemistry, water, waste, or durability. Ask which issue is in scope and what evidence is attached. Do not treat the word as a fibre name.
Can you skip sampling sustainable fabric?
Sample the named cloth. A claim is not a swatch.
What should stay on the brief besides the keyword sustainable fabric?
Claim scope, fibre, construction, weight, and ordinary tests. Ranking one fibre as the most sustainable without context.