A rayon black dress is a garment made from rayon fabric and is primarily colored black. Rayon is a synthetic fiber known for its softness, breathability, and draping qualities. It is often used as a substitute for natural fibers like silk or cotton due to its affordability and versatility.

Rayon fabric has a smooth and silky texture, which gives the dress an elegant and luxurious appearance. It is lightweight and breathable, making it suitable for both warm and cooler climates.