There is no magic ingredient. For high-end clothing you need to deliver both at product and brand level. It means a brands which is clearly positioned, has a strong and unique promise, and delivers on experience. From a product point of view, quality of materials but also technical aspects are critical to support the price tag which is usually charged within the high-end segment. For example the origin of materials, the type of fabric, the stitching technique, they are all aspects who can ensure your product shopper acceptance in the high end segment
The first thing that comes to mind is what are brands that are in existence that fit this model and what seems to be their most important attribute.
What stands out to me is their Branding. It is their brand, that positions them as a success. Their branding is positioned to make you want to incorporate it into your lifestyle. Their brand influences their packaging, their presentation, their image, the expectations are set forth from the Brand.
You can have a great product, made with the highest integrity, that is exquisite - but without a brand to connect that to - no one will ever connect with this product.