The sageo is the braided cord threaded through the kurigata, a small knob on the saya (scabbard). Historically, it served practical purposes such as securing the saya to the wearer's obi (belt) or binding a restrained opponent's hands. On a display collectible, the sageo is a key aesthetic element — its color, material, and length all contribute to the overall visual harmony of the koshirae. A brown sageo is particularly sought after because it complements warm-toned fittings, lacquered saya, and matching brown ito (handle wrap), creating a unified, traditionally grounded presentation that collectors find visually cohesive.