Body Protector (Plastron) from SPES
This body protector is designed to protect the torso from thrusts and can be worn both outside and inside of the jacket. It is made of six layers of thickly woven, quilted fabric but it has no padding of its own. It also has an additional collar with a turned edge that protects the neck. Fastened in the back with three straps.
More specs at: https://www.thehemashop.com/body-protector-large