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The suit's torso.

The Apollo spacesuit was redesigned for the final three Apollo flights, all of which featured the Lunar Roving Vehicle (LRV): The earlier A7L suit's entrance zipper, which previously started just below the helmet attaching ring, went down the back of the suit, between the legs, terminated in the front crotch area, and had a snap cover, was moved to start at the right shoulder (under the flap seen here), run diagonally around the back of the suit, and terminate on the left hip.

The suit was also made more flexible; this and the redesigned zipper made it possible for the astronauts to be able to be seated on the LRV.

See my Apollo A7LB suit page for information about the chest connectors.