Here is one other May 1975 blurb I found about your inquiry: "Soo Yung Lee, designer, has formed a rtw company under her own name, operating out of her home at 157 East 72nd St. Ms Lee was previously with Baron Peters Co., Inc. At one time she was with Sarmi, which sold her designs under the label Soo Lee for Sarmi Boutique. (Sarmi is no longer in business)..."
and
"(June 1975) NEW YORK: A bright young designer, Soo Yung Lee, has just opened her own firm of sportswear and big sporting coats."