label. Duo de Mar. description. Look sexy & stunning wearing the Rocablanca dress by Duo de Mar. A sheer, white dress with long sleeves and plunging neckline. material. 100% Cotton Gauze. Every handmade piece took 2-3 days to be made by Mexican Artisans. Please note that due to the nature of the piece dimensions and chain color may vary slightly. All rims and armatures.