The antonyms for the phrase "custom made" could be "off-the-rack," "pre-made," "factory produced," "ready-to-wear," or "mass-produced". These terms imply that the product is not personalized or tailored to fit the specific needs of the individual customer. They suggest that the item has been produced in large quantities and is readily available for purchase without any customization. While custom-made products may be more expensive, they offer a unique and personalized experience to the customer, giving them the opportunity to express their individuality and preferences. In contrast, the antonyms suggest a less specialized and less personal experience.