I think i have found another one:
Why and how? Why would someone in Faerun create such a magical item, and how does an
armor help you deal piercing damage but only when you're wounded? Does your blood seep into the armor, which then powers it up and it shoots hardened blood needles at your opponents, but timed to only occur when you make an attack???
At the very least, since the armor is clearly an OFFENSIVE item, the description should reflect that: "-the lives of those the shirt has taken"