Plus-size dress by John Zack Plus, Worth making plans for, Unlined for a lightweight feel, Plunge neck, Long sleeves, Tie waist, Zip-back fastening, Regular fit, Just select your usual size. Turning catwalk styles and red-carpet looks into a collection of next-level dresses, London label John Zack preps you for the party. Fall for its plus-size range of lace, ruffle and cold-shoulder maxi styles.