Stella McCartney is about to release a 42-piece Australia-exclusive line in Target stores on March 12. Her only other such collaboration, a limited-edition range for European chain H&M in 2005, sparked brawls at cash registers across Britain. The Target range will include a trench coat, tailored jacket and pants, shirts, a day dress and an embroidered cocktail frock. McCartney said she hoped the garments would be “something you want to keep forever’’.