When was the tendency of a track, it often results in a ” design studio “. These agencies offer to prospective players in the fashion industry ” trend books”. These are big magazines sold at exorbitant prices -up to 4,000 euros- and filled with photos, sketches and explanatory texts. They have 18 months in advance, what the trends for a particular season. Twice a year, the “trend committees ” meet (stylists, colorists and sociologists). It is after having crossed and analyzed the data, they create thematic, four per season. Each theme associated atmosphere, colors, materials, shapes.