The Trauma Suit is a mess of bandages and slings across Chibi-Robo's head and arms, making it appear as if he has suffered some sort of injury.
Most characters react to the suit with sympathy, believing Chibi-Robo has fallen down. Sophie reacts to this suit with fear.
Its pose allows Chibi-Robo to teleport back to the Chibi-House. Posing in the Trauma Suit and then leaving the controller still for approximately 10 seconds will cause Telly Vision to assume Chibi-Robo is out of energy and takes him back to the Chibi-House.