custom-made item; made-to-order article
Refers to a product that is uniquely created or tailored to a specific request, not mass-produced.
This bag is a custom-made item, the only one in the world.
He had a made-to-order article created with his own design.
Compound of オリジナル (original, unique) and 品 (item, goods). The exact historical derivation is uncertain, but it follows a common pattern for describing custom-made products.