Petite jumpsuit by John Zack Petite, Done in one, Halter neck, Plunge front, Wide legs, Zip-back fastening, Regular fit, Not too loose, not too tight. Turning catwalk styles and red carpet looks into a collection of affordable dream dresses, London label John Zack channels a fun, party girl aesthetic. Now perfectly designed in petite proportions, the John Zack Petite collection is party prepped with jumpsuits, bodycon dresses and lashings of lace.