Mori designed three consecutive uniforms for the flight attendants of Japan Air Lines (JAL). The first uniform was worn from 1967 to 1970; the second, which created a sensation by featuring a miniskirt, worn from 1970 to 1977; and the third worn from 1977 to 1988. From 1989 to 1996, Mori employed Dominique Sirop as a designer. He became a "grand couturier" in 1997. In 1992, Mori designed the official uniform for the Japanese Delegation to the Barcelona Olympics and, in 1994, the official uniform for the Japanese Delegation to the Lillehammer Olympics. Also in 1993, Masako, Crown Princess of Japan wore a sleeveless white gown designed by Mori for her wedding ceremony. Mori had the patronage of Masako, Crown Princess of Japan, Hillary Clinton, Nancy Reagan Renata Tebaldi and Princess Grace of Monaco Grace Kelly.