The price of sexy nighties is primarily driven by fabric composition. Silk (19-22 momme) represents the premium tier, offering high breathability and luster, whereas satin-weave polyester is the cost-effective alternative for mass markets. For lace components, buyers should specify eyelash lace or Leavers lace for high-end collections, as these resist fraying better than standard chemical lace. Ensure the fabric has a colorfastness rating of Grade 4 or higher to prevent dye bleeding, especially for dark colors like red or black.