It has a base Type resistance of 8 to Blunt, 0 to Edged, and 8 to Piercing. The zero resistance stat to Edged is neither especially hazardous nor at all rare; all body armor other than Segmentata, Plate, and Fluted Armor has at least one zero resist. Body armor has the fewest number of Tiers with whole number resists to all three Types, the next lowest being Leg armor with four. Arm armor has five and Head armor has seven. Shields have none.
There are 32 instances of BRONZE, IRON and HAGANE Breastplates as drops or chest loot; all or almost all are in the first playthrough. Most of them are 8/255 chance to drop, four are a 13/255 chance, and eight are a 16/255 chance. There are no LEATHER, SILVER or DAMASCUS breastplates in the whole game