Goose origin is one requirement, not the whole brief
Ask why goose down is part of the design: an approved material policy, product identity or a technical target. Then define the remaining acceptance criteria. Do not assume species establishes loft or a particular price level.
Select a product variant
Review the product pages for the relevant color category, then specify the composition and fill-power protocol. Ranges, lot availability and commercial terms require confirmation. Test the proposed material in the finished construction before approving ongoing supply.
Add the documentation brief
State any recycled-content certification, origin classification or third-party report requirement. Keep those documents distinct from the laboratory performance specification, and match both to the actual order.