When sourcing cocktail dresses, fabric choice determines both the price point and the target market. For high-end collections, prioritize natural silk, heavy satin, or premium lace. For the mass market, high-density polyester blends, spandex-infused crepes, and sequins are preferred for their durability and stretch. Ensure the fabric has a colorfastness rating of Grade 4 or higher to prevent bleeding, especially for dark or vibrant evening colors. Always request fabric weight (GSM) specifications to ensure the material isn't too sheer.