Midare Toushirou was once owned by Hosokawa Katsumoto (細川勝元), who referred to the blade as Midare Yoshimitsu (乱吉光) during the time. In the later Edo period, the sword was passed on to the Abe-clan (阿部氏).
Midare is currently under the possession of the Osaka Museum and is labeled as one of Japan's Important Work of Fine Arts (重要美術品 juuyou bijutsuhin)
The reason why Midare is dressed differently compared to his brothers is because of his unique style. Yoshimitsu is known for forging tantous with suguha hamon(直刃), a straight style hamon, while Midare is the only one in-game with midare hamon(乱れ), an irregular wave. The hamon is the crystalline pattern of the hardened cutting edge of the blade, it is a key point for artistic appreciation of Japanese swords.