The wearer breathes in and out of the breathing bag, which is round his neck. On the way, the oxygen that he uses is replaced from the cylinder on his side-pack, and the carbon dioxide that he exhales is absorbed in sodalime or similar in the canister which is on his side-pack. This is a real set, and not a random fictional throw-together designed merely to "look cool". The suit looks so weird The suit is my ordinary Wetsuitman. The Salvus breathing set is the parts strapped onto him. It is almost a pity that is a historical piece. Blame Siebe Gorman Ltd, not me. They designed it. But that needn't stop people using it in a sci-fi context. Until I made this model, I didn't realise how much there is to such a simple breathing set as a Salvus. Including e.g. counting the corrugations on the breathing tubes. Let the conforming parts be a conforming garment and the rest one or more parented-on props or models One place where that would not work is the diagonal strap. In the real set, most of that strap lies against the wearer's body and conforms, but its lower end at front and back stops conforming and goes across to the top corners of the sidepack. I would have to cut that strap in the two places where it stops conforming to the body. That would mean that the sidepack would be a model (not prop) with the lower stumps of the straps as IK-chain tails; the ends of those stumps would have to mate with the cut lower ends of the straps as they are in the conforming garment's abdomen. I could IK-parent the ends of those stumps to the garment's abdomen, but not to one particular place in the garment's abdomen, and so the rejoined cut ends would come apart again as the garment's abdomen is pulled about by joint movements etc. if you cut the model ... making it just a regular old conforming figure That would likeliest mean assigning the side-pack, which is mostly made of rigid metal, to be part of the conforming garment's abdomen and liable to be warped weirdly as the man's chest/abdomen and abdomen/hip joints flex about. And, unless the breathing tube is an IK-chain it would not behave realistically as he moves his head.