King was not a designer in the traditional sense in that she did not make clothes, but rather, she created water color sketches of her fashions. In 1932, she was discovered by Lord & Taylor, the first store to sell her garments. Later that year, she opened her own couture salon on East 61st Street in New York. Her designs were popular among socialites. In 1943, she designed Flying Fortress uniforms for women workers at Boeing Airlines. The Museum at FIT held an exhibition of her design, "Muriel King: Artist of Fashion, " in 2009.