Bespoke Wallets [needs new title]

Most would agree that bespoke design far out performs mass production on all fronts, but especially in terms of user experience of a product (in terms of quality). Most things are mass-produced - which is good for the sake of supporting and encouraging technological development, population growth, and so on. However, not all objects are maximized for individual use; wallets and other such objects are personal and, by nature, require bespoke design and fabrication. I'm in search of a possibility for bespoke design within mass production, ideally, a process that is in line with ethics and sustainability.