A long coat generally describes any outerwear that falls below the knee, often with a more dramatic, elongated silhouette. A car coat usually has a straighter, slightly shorter cut that ends around mid-thigh to above the knee, designed for ease of movement. Both work well over everyday outfits, but full-length pieces offer more coverage and a stronger vertical line. Choose based on the proportion you want against your usual trousers, dresses or skirts.