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Pieter Mulier

Creative Director, Alaïa

Raf Simons’ right-hand man at Jil Sander and at Dior, Mulier was tasked with executing Simons’ vision for the American brand before leaving with the designer in 2018 and now taking on the helm at Alaïa.


Pieter Mulier is the creative director of the Richemont-owned Maison Azzedine Alaïa brand. He was previously Calvin Klein’s creative director and Raf Simons’ longstanding right-hand man, tasked with executing the designer’s vision for the iconic American brand. In 2018, when Simons left Calvin Klein  less than two years after his debut, Mulier also exited the brand. 

Belgian-born Mulier studied architecture at the Brussels Institut Saint-Luc, and was subsequently invited by Simons to do an internship at his namesake label, before returning in 2002 as senior head designer to lead the creative team.

He followed Simons to Jil Sander in 2006, where he became the director of accessories. In 2012, when his mentor invited him to join Dior, Mulier jumped at the chance to work in an atelier of one of the original Parisian couture houses, assisting Simons as the link between the designer and the studio staff.

His role at Dior was highlighted in Frédéric Tcheng’s documentary “Dior and I,” which revealed Mulier as the middleman between the Simons and the atelier.

When Simons moved to lead Calvin Klein after three years at Dior, Mulier was appointed creative director, charged with managing the design teams. The debut collection for the Autumn/Winter 2017 season received critical acclaim — Mulier took a bow with Simons at the end of the show. 

Mulier was appointed creative director of Alaïa in February 2021. His first collection for Alaïa was shown in Paris for Spring/Summer 2022.

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The people shaping the global fashion industry, curated by the editors of The Business of Fashion, based on nominations and on-the-ground intelligence from around the world.