When evaluating horsehair fabric (also known as crinoline or haircloth), you must focus on the composition ratio. Authentic high-end horsehair fabric usually consists of natural horse tail hair woven with a warp of cotton, silk, or linen. For upholstery, ensure the width of the fabric matches your needs, as natural horsehair length limits the loom width (typically 22 to 27 inches). Additionally, verify the density (picks per inch); a higher density indicates better durability and a smoother finish for luxury applications.