Ah, No, it's not three seperate blades like a Sai, it's kinda like a pyramid blade: ie one blade with three edges as opposed to the normal two.
I'm making the flak vest from scratch, at the moment, I'm just using regular brown material.
As Kal'buir is a Jango era mando, I'm giving him Jango era armour and gauntlets with modificiations for the knife (hence my posts in the Jango forum)