Upon completion, he began the task of honing his talent while working as an assistant designer for a Seventh Avenue dress manufacturer.
After using his fashion illustration skills to supplement his income, Sung opened a tiny shop called Moon initially located on Carlton St. just east of Sherbourne in Toronto's Cabbagetown area around 1977.
His loose fitting and comfortable desert colour designs were a major contrast to the black leather and skinny jeans of the prevailing Punk scene.
In 1981, the Alfred Sung label was launched in the United States through Saks Fifth Avenue, later appearing in Macy's, Nordstrom, Neiman Marcus and Bergdorf Goodman.
[citation needed] In 1991, Sung opened a new set of free-standing stores across Canada which housed his premium denim collection for men and women, titled "Alfred."
Following the success of his ready-to-wear lines, Sung developed a bridal collection sold at specialty boutiques across North America and increased the licensing of his name in several categories, including men's suiting and fragrances, eyewear, watches, furs, luggage and leather goods.