Maybe not "tailoring", but the limosine briefcase by Moynat is completely made by hand and is a good example of the French style and workmanship that you see throughout this thread: attention to detail, high-quality materials, precision, and modern variations on classical forms and shapes:
I'm very close to French house, Moynat. I was in charge of their launch at Isetan in Tokyo.
If you have any questions don't hesitate to contact me.
Moynat limousine trunk was made concave bottom to perfectly fit on the roof of the cars.
The Limousine briefcase, named after the eponymous trunk, has a similar concave bottom to make it easy to place the case on one’s knees and use as a mobile desk.
And when you're walking, your knee doesn't hit the briefcase because of the ingenious shape.
Designer, Ramesh Nair seeks always the perfection.
I went two times at their atelier in middle of Paris (2 min from the flagship store).
They have the best materials, good sense of details, no rush for the orders (only small quantity) and they can do everything made-to-order.
Amazing craftsmanship !