The Irish designer follows in the footsteps of the likes of Christopher Kane and Proenza Schouler who have previously teamed up with the high-end denim label.
Rocha commented on the line, which is launching in late 2014: "It's an exciting prospect to work on this project, learn from J Brand's denim expertise and see how it evolves over the coming months in the run up to the winter launch."
J Brand's CEO Jeff Rudes said: "Simone has developed such a strong aesthetic in a very short space of time. Her maturity and sense of direction as a designer are unparalleled for her generation; we are thrilled to have Simone creating a capsule collection with us."
Rocha made her London Fashion Week debut in spring/summer 2011 and has gone on to achieve huge success for her romantic and contemporary designs, including winning the Emerging Womenswear Designer honour at the 2013 British Fashion Awards.
