In fashion, the Reverse adoption theory, or Trickle-Up theory, states that fashion styles begin with youth, street fashion from low income groups. The innovation then moves progressively up the fashion ladder, and a designer can use it in their collections and the styles can be adopted by more traditional consumers to the more elder and upper-income groups. In the case of the Peasant collection by Saint Laurent, he took a very traditional look from the peasants and gypsies in europe and turned it into a fashion trend.
