When sourcing party wear, fabric quality is the primary determinant of value. For luxury segments, prioritize natural silk, high-grade chiffon, or heavy satin with a weight of at least 80-100g/m² to ensure a premium drape. For mid-range markets, high-density polyester blends offer durability and wrinkle resistance. Always request fabric composition certificates to verify the percentage of spandex for stretch and comfort, and ensure colorfastness ratings are Grade 4 or higher to prevent fading after dry cleaning.