Jenna Lyons, president and executive creative director at J Crew, is leaving the company after 26 years.
She will step down as president but remain as a creative director until the end of her contract, which expires in December 2017.
Lyons has held her current role since 2012 and previously worked in design positions across the business.
The US retailer said it will not replace her and will transfer her responsibilities to other members of the executive team.
Somsack Sikhounmuong, currently head of women’s design, will be promoted to chief design officer with responsibility for the women’s, men’s and crewcuts design teams, effective immediately.
Sikhounmuong has been with J Crew since 2001 in senior design roles, and from 2013 to 2015 served as head of design for sister brand Madewell.