Plus-size dress by John Zack Plus, For that thing you have to go to, Plunge neck, Knot front, Zip-back fastening, Regular fit, Not too loose, not too tight, Exclusive to ASOS, We're committed. 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.