Horsehair refers to the coarse, stiff hair that grows on a horse's body, specifically their tail or mane. It can be used to make various products like bristle brushes, violin bows, or upholstery stuffing. Full definition
«Judy» Guipure lace MC jacket, «Tina» mesh corset with exposed boning, «Ines» high waisted flare pant with horsehair trimmed hem; ivory tulle opera gloves by Houghton. (brides.com)
The top maker of horsehair brushes today is Vie - Long, based in — you guessed it — Spain. (businessinsider.com)
Style 6453, «Josie» strapless tulle ball gown wedding dress with a crystal sweetheart bodice and a tiered skirt with horsehair trim, Hayley Paige (brides.com)