Dress by John Zack, For that thing you have to go to, Plunge neck, Button placket, Puff sleeves with tie detail, Ruffle hem, Regular fit, Just select your usual size. Turning catwalk styles and red carpet looks into a collection of affordable dream dresses, London label John Zack channels a fun, party girl aesthetic. Look to the John Zack range for party dresses in sleek bodycon styles, bold leopard prints and punchy acid colours.