There's no fashion if nobody buys it. Who said this?

The one who said "there's no fashion if nobody buys it" is Karl Lagerfeld. Lagerfeld focuses on the flow of the fashion business, that in order to create fashion, it needs a substantial number of purchases from people. And that fashion is also greatly affected by the changes of technology. What may be fashionable now, may not be fashionably accepted by the people tomorrow.