In 1966, the milliner began designing women's wear and became known for creating the American "Sportswear" look which is described by Glamour as the perfect mixture of simple, comfortable and sexy. This look attracted a lot of celebrities and helped make Halston a household name. He became known for dressing and often traveling with Liza Minnelli, Naomi Sims, Elizabeth Taylor and many other stars.

After becoming a celebrity in his own right, Halston sold his business to the Norton Simon conglomerate in 1973 but stayed on as principal designer (via Britannica). In 1982, the designer began working on an affordable clothing line for J.C. Penny. This deal was extremely ahead of its time and helped to continue to grow the Halston brand as it made his luxury designs more accessible. Through this deal, he was able to bring his signature Ultrasuede shirtwaist dresses, perfectly tailored suits, and halter dresses to the general public.

In 1990 Halston died from AIDS-related complications. At this time, the iconic designer was worth an impressive $100 million according to Wealthy Genius. Though the designer is no longer with us, he continues to be remembered as one of the most influential designers of all time.