Times are tough for retailers, so stores are trying to shake things up. If, like J. Crew, you’re a clothing retailer that only sells your house brand, the exit of your longtime creative director might be a step toward turning around flagging sales.

J. Crew Group — which includes its namesake brand as well as Madewell — says Creative Director Jenna Lyons is leaving after a total of 26 years with the company. She won’t be replaced, but the current head of Women’s Design, Somsack Sikhounmuong, will be promoted to Chief Design Officer and will take on some of her former responsibilities.

She’ll stay on for the time being as a creative advisor until her contract expires in December, and says she is looking forward to supporting the team “through this natural transition.”

The company’s chief executive says it was a mutual decision for Lyons to walk away.

“Jenna and I got…