Copyright doesn't protect fashion
That said, it is possible to protect other works relevant to the fashion industry using copyright. There is far less controversy surroundin the protection of photographs, films, collages, sculptures etc.
The Red Bus Case
Temple Island v New English Teas (the red bus case) was discussed in relation to Kate Spade's alleged copying of Vera Neumann's poppy design. The case demonstrates how difficult it is to draw a line between copying an idea or concept such as a poppy, and copying the expression of that idea, i.e. Vera Neumann's design. Further, the PCC's finding that a person who recreates the subject matter of another person's photograph can infringe copyright in that photo is relevant to the fashion industry as magazines and catalogues often recreate runway or haute couture photographs to showcase high street clothes.