The mood of the AW12 catwalks was adult and polished, with ornate embellishment taking centre stage. Sequins and shimmer have always dominated party wear, but this season designers took illumination to extremes. Karl Lagerfeld decorated his pieces with never-ending glitter and coloured diamond clusters – the perfect compliment to his striking crystal-adorned runway. From lurex-threaded knits to gem-studded eyebrows, everything had the shimmer factor. At Louis Vuitton, Marc Jacobs glamorized black separates with incredible, iridescent appliqué shapes (below left), while Prada created a showstopper by adding prominent costume gems to a vibrant orange coat (below right). Rachel Bilson embraces Chanel’s mythical glamour in her monochrome frock by the label- the…