BY APPOINTMENT: Roberto Cavalli is launching a made-to-measure service for clients who want that certain cocktail, evening or wedding dress in tune with the spirit of the Italian fashion house. Called Roberto Cavalli Saint-Honoré, the service will offer entirely handmade dresses in a special private space above the Rue Saint-Honoré store. No more than 35 dresses are to be produced each year, with prices starting at 30,000 euros, or $41,950, for a cocktail dress. Roberto Cavalli’s wife, Eva, held a press conference in Paris Monday and stressed that the collection isn’t the start of a couture collection, but an extension of a service the house has been offering for red-carpet and other relevant events. “Clients who want a special outfit from Cavalli now will know that they can obtain it,” she said.