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Established in Paris in 2022, Siegenthaler proposes a versatile vision of unisex ready-to-wear, blending sophistication with sustainability. Our signature is modularity—clothing that adapts, converses, and transforms with the wearer’s personal journey.

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Born in Asia of Sino-Vietnamese origin and adopted by a Swiss family, Duc Siegenthaler is a fashion creator based in Paris. This multiculturalism forms the foundation of his artistic approach: developing a singular vision of clothing as a second skin that modulates identity. A graduate of HEAD - Geneva (2017), where he refined his conceptual vision under the mentorship of Glenn Martens, he then gained solid experience over three years at Y/Project, where he directed the Flou and Tailoring departments. In 2023, he founded his brand SiEGenThaLER, exploring contrasts between structure and fluidity. His passion for craftsmanship and taste for innovation have also enabled him to collaborate with Nike and be selected to represent the young generation of French design at KEQIAO Fashion Week in Shanghai in October 2024. He also teaches at Atelier Chardon Savard in Paris.