Mathieu Castanier is a Savile Row–trained master tailor and fashion designer known for blending the discipline of traditional bespoke craftsmanship with a distinctly modern vision. As founder and creative director of his eponymous house, he creates one-of-a-kind garments that feel as effortless as they are impeccably constructed.

His craft was forged on London’s legendary tailoring street, where he mastered British bespoke structure from hand-drafted patterns and full-canvas construction to precise hand-finishing. This foundation was later refined alongside Italian sartorial masters, whose softer shoulders, higher armholes and natural drape introduced a new language of ease and fluid elegance.

Today, his work is defined by this dual heritage: the architecture of British tailoring meeting the relaxed sophistication of Italian craft. The atelier offers a complete bespoke wardrobe suits, jackets, shirts, leather pieces and custom shoes all cut from unique patterns and refined through multiple fittings to achieve a silhouette that moves with the wearer rather than against them.

A pioneer in the use of advanced tools, Mathieu integrates 3D configurators and high-definition digital design to explore proportions, fabrics and finishing options long before the first cut. Technology remains in service of the hand and the eye: every decision is ultimately shaped by the dialogue between tailor and client.

His discreet international clientele from business leaders and finance professionals to artists and entertainers comes to him for more than a garment. Each commission is treated as the beginning of a long-term wardrobe relationship, guided by one principle: true bespoke should feel like a second skin and tell a story that belongs only to the person who wears it.