How, two decades after his death, did Mondrian become a brand icon, and make a lasting contribution to the “youthquake”?

Paris show features the “lobster dress” that the pair created for Wallis Simpson’s wedding

Christie’s is to offer the never-exhibited painting in a New York auction in May

As five major museums in Paris, including the Centre Pompidou and Musée du Louvre, put on shows marking the 60th anniversary of his first collection, the Turin fashion entrepreneur Giorgina Siviero explains the impact of Yves Saint Laurent