Petticoats were revived by Christian Dior in his full-skirted "New Look" of 1947. Tiered, ruffled, stiffened petticoats remained extremely popular during the 1950s, especially with teenage girls. Typically, at least three single petticoats were worn, until manufacturers began making double and triple layer petticoats. A narrow slip was usually worn under the petticoats, especially the crinoline type, because they tended to be 'scratchy'.