Halston Heritage Gown in Blue. - size 4 (also in ) Halston Heritage Gown in Blue. - size 4 (also in ) Shell: 91% poly 9% elastaneContrast: 70% polyurethane 27% poly 3% cottonLining: 100% poly. Dry clean only. Fully lined. Metallic trim. Side seam slit. Back cut-out detail. Hidden back zipper closure. HALS-WD429. MEC161757C. Launched in 2009, Halston Heritage takes the iconic silhouettes from designer Roy Halston Frowick and reinterprets them for the modern woman. Expect a timeless approach to style along with luxurious designs that reference pieces worn by Bianca Jagger, Liz Taylor, and Anjelica Huston.