Fishtail trousers originated in the 19th century as part of formal and military wear, distinguished by a “fishtail” back—a V-shaped notch at the rear waistband. This design was developed to accommodate braces (suspenders), ensuring a secure and comfortable fit by allowing the trousers to sit higher on the waist without pulling. The style became particularly popular in Victorian and Edwardian fashion, often seen in morning dress and military uniforms. As belts replaced braces in the mid-20th century, fishtail waists became less common, but they remain a hallmark of vintage tailoring and are still favored in bespoke and period-style menswear today.
