I'm calling it: either the MA-53 Overwatch chestplate color-matched to the RD-17a Phalanx set, or you managed to find the TT-16a Powered Assault set.
Yep, it is the complete TT-16A Powered Assault Set. Took months to get the chest piece. Same graphic as the MA-53 Overwatch. I actually have two of those cartel chests on my companions for the matching scheme