 He was especially known for his sailor-inspired clothes, chemise dresses, wool jersey dresses, and Empire-line dresses, as well as culottes and sequin-covered, "mermaid" evening gowns and sheath dresses.In the late 1960s, during the height of his popularity, Norell's "mermaid" gowns sold for $3,000 to $4,000, "considered the most expensive dresses in America" at that time.To make sure that imitations of his design for culottes would be constructed correctly, Norell published the specifications in "Women's Wear Daily".