For his first major professional assignment Lawrence Marcus asked him to compete in the contest to design Grace Kelly's bridesmaids' gowns for her marriage to Rainier III, Prince of Monaco.
[2] Marcus scouted Monaco's Saint Nicholas Cathedral in a prenuptial visit and provided ideas based upon the building's architecture, decor, and general surroundings, which Hong then worked into the winning design.
The top layer of the gown was fashioned from sheer silk organdy and featured a high-necked collar and full bishop sleeves.
The simple bonnet of yellow silk organdy was designed by Joseph Hong and made by Don Marshall.
The Philadelphia Museum of Art exhibited these beautiful gowns in 2006 during "Grace Kelly: Icon of Style to Royal Bride".