The original note, as written at the time
A big problem solver for outer space exploration might be organic, or organic-like, suits that simulate a man’s entire environment here on earth. They can be fine tuned to adjust to the conditions of the destination. The way the suit is used is this way: you wear it like an exoskeleton.
Ongoing development
Organic, or organic-like, suits that simulate a person’s entire earthly environment, wearable like an exoskeleton and fine-tunable to the conditions of the destination.
The insight is that a spacesuit today is a pressure vessel you carry. It maintains one condition — roughly sea level — everywhere, which is why it is heavy, stiff and exhausting. An environment suit would maintain a gradient, adjusting as the wearer moves between a habitat, a vehicle and open ground.
The organic framing matters more than it sounds. A biological skin does not maintain a fixed condition; it regulates, sweats, vasoconstricts, and repairs itself. A suit made of living or living-like material could do the same: manage moisture at the skin, scrub carbon dioxide locally, heal a puncture by growing over it.
The exoskeleton is the structural half, and it is what makes the weight tolerable. If the suit carries itself and the wearer only carries the suit’s inertia, then a heavy protective layer becomes wearable for hours instead of minutes.
The hard problem is the boundary. A living membrane needs to be fed and it needs to not be infected, and a suit that is a culture is a suit with a husbandry requirement. Nobody wants to maintain a pet before a spacewalk.
Fine-tuning to the destination is the ambition and it should be honest about the timescale: adaptation takes generations in biology and months in engineering.
Skin, not armour. That is the direction, even if the timescale is long.