Requirements for a lunar suit were extremely demanding. Consider two points which actually contradict:
1) It had to have protection from sharp lunar rocks and possible meteorites (no lunar atmosphere to protect them).
2) But it also had to have enough room to let the astronauts move around relatively unhampered.
Let’s remember that these guys had to stoop, run, jump, and even drive on the Moon. In other words, they needed to be dressed for the occasion. The general spirit of the suit's makeup remains even today, though an advancement has been made to the new Z-2's upper torso: a hard composite in which will likely be the basis for the suit designed to put humans on Mars.