I think bespoke is a pretty reasonable word to use given the items are made to order to the buyer’s preference for materials etc. Nothing trendy or poncey going on.
Very nice. I go through 1x cheap Chinese plastic bags a year at £8 each, but I use them as a Blood Bike volunteer so they need to be totally waterproof. I would struggle to justify the expense of such an exotic thing..... Good luck with them though, they are a thing of beauty and practicality...