Would Malchus have been wearing body armor?
https://en.wikipedia.org/wiki/Malchus
"Malchus (/ˈmælkəs/; Koinē Greek: Μάλχος, romanized: Málkhos, pronounced [ˈmal.kʰos]) was the servant of the Jewish High Priest Caiaphas who participated in the arrest of Jesus as written in the four gospels. According to the Bible, one of the disciples, Simon Peter, being armed with a sword, cut off the servant's ear in an attempt to prevent the arrest of Jesus."
The guy who got his ear cut off was not a soldier. He was a servant of a Jewish priest. Such a servant would not be wearing body armor.