You are mixing art, craftmanship and mere production as applied to a single general concept, clothing, that can be as exclusive or mass-oriented as those three modes of handling allow it to be.
If the product is based on a general abstract formula of elaboration, that is, clothing or jewelry, not dependant on the actual raw material or the excellence of its elaboration by further refining on that basic formula, as is the case with perfectly cut perfect diamonds, or high-end cars or haute couture, any sort of elaborated product can equally be either exclusive or mass-oriented, provided you have the right technology to support it without any special cost... all that you can think of can be a luxury, from just water, or the access to it, to a computer, depending on the society you live in and the technology that runs it.
So don't get me any more of that bs concerning clothing being mass-oriented per se. Covering your body may be more or less basic and mass-oriented, but clothing is so general and complex in its intefiniteness as to invalid your statement under its own weight... is leaf-covering clothing? is it mass-oriented by nature? or would that rather be leather clothing more fundamental to serve the purpose of covering and, therefore, more truly mass-oriented?