Mainbocher (mĕn'bōshā`) (Main Rousseau Bocher), 1891–1976, American fashion designer, b. Chicago. He was known for his expensive, elegant evening clothes; cardigan sweaters with jeweled buttons; and high-waisted, long, and lacy or transparent ball gowns. He opened his Paris house of couture in 1929 and his New York house in 1939. He designed war uniforms for the WAVES and SPARS and made costume designs for stage productions. He introduced the strapless evening gown, and made the wedding dress for the Duchess of Windsor. His signature fashion designs included pearl chokers and short, white gloves.