This style of armour Tosei Gusoku was developed during the Momoyama period. Its development drew heavily from experience derived from prolonged periods of warfare. It is characterized by its simplicity and flexibility and a cuirass with its two hinged plates that open on the left side and the right side laced together. The small iron gold lacquered plates are laced together with white lacing (kebiki odoshi). On the reverse is the gattari, a means for supporting a banner on the upper part and machiuke for the lower part. The Momoyama period was the golden age of flags and crests. Every soldier carried a small flag (sashimono) mounted in these brackets. The kote (armored sleeves) are Bishamon gote type with shoulder guards (sode) attached to the upper part of the sleeves.

The Hineno helmet has its peak lacquered to simulate a russet iron surface (sabinuri). A similar helmet is illustrated in Tokubetsuten Nihon no buki bugu (Special exhibition Japanese Arms and Armour), Tokyo National Museum, 1976, pl. 374

The armour is entirely in the style of the Momoyama period, and although mainly dating from the late Edo period, certain portions could well be earlier pieces remounted