The request
“We sell one-off, unique pieces. The website shows a quantity box on every product. For items where there's only one, it shouldn't be there.”
A quantity selector that contradicted the store's story.
The approach
We hid the quantity selector on products with a single unit in stock and kept it on products with more, with plus and minus buttons for those.
What we shipped
Quantity selector hidden for single-unit products
Plus and minus buttons on multi-unit products
Inventory-driven display