Worth had a business partner,

… a young Swede named Otto Gustaf Bobergh, and in 1858 the duo set up in business at 7 rue de la Paix, naming the establishment Worth and Bobergh.  The business stayed open even after his death under the ownership of his sons, and notable designer son Jean-Philippe Worth (which gets confusing in the history books).

(Photo: original Worth and Bobergh fashion house on Rue de la Paix, Paris)