A pressure suit, worn beneath the Colonial Warrior uniform, allows a pilot to survive the g-forces that can be achieved by flying a Viper (TOS: "Lost Planet of the Gods, Part I").
Single black wires connect between the black bands of the beige jumpsuit, and a small circuit board with two wires is attached to the black band above the right kneecap. Presumably the circuit board connects to the leg computer on the outside of the Warrior's uniform.
A small circuit board with two wires leading outward is affixed to a black band above the wearer's right knee.
Black wires and black sections of the pressure suit. Note the silver detail running on the wearer's mid-right of the sternum plate.
Neck opening detail of the pressure suit.