Dear customer, thank you for your interest. This dress is unlined, woven, and made of 100% polyester fabric. In general, it is not a very thin, tulle-like fabric, but it can show the outlines a little, especially in light colors (beige) and under strong light. If you prefer a more closed look: - Seamless underwear close to your skin tone - We recommend using a thin inner lining/short combination dress if you wish. We kindly ask you to review the product comments for real user experiences regarding fabric thickness and see-through.