Identifying silver jumpsuits in old scifi (warning image heavy, various films/shows)

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Hi there. I've seen a fair bit of older scifi so I've noticed some things pop up over the years; in particular, very low budget films/shows having these sort of silvery jumpsuits pop up:

The Spy with Ten Faces (1966)

Hold On (1966) (these are meant to be spacesuits, but the helmets are obviously just racing/pilot helmets painted silver

Doomsday Machine (1972) (also a case where its just racing helmets meant to stand in for futuristic gear)

The Starlost (1973) - infamously cheap Canadian scifi series, so I wonder if these weren't just off the rack and altered with red lining (that wide shouldered and slightly snazzy checkerboard patterned stop is almost certainly bespoke made though )

The Tomorrow People 'Achille's Heel' - again a case of a very, very low budget scifi show so its best to assume these could have been off the rack and only the helmets made

Godzilla vs Mechagodzilla and Terror of Mechagodzilla - the Black Hole Planet 3 aliens in both have suspiciously Earth-like outfits despite coming from outer space, so I have to feel they are off the rack (with the leader's in the former film being altered)

Space 1999: various silvery jackets in the first season, which mostly utilized bought gear barring Rudi Gernreich's Moonbase uniforms, the spacesuits + some of the aliens. Another type of silver jacket was bought for the series, and was called a 'fun garment', which makes me wonder where these black lined jackets were from.

 

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Space 1999 again - also had these silvery jumpsuits (worn with prop spacesuit helmets made specially for Space 1999) used for extra spacesuits/firesuits. According to Catacombs (the Space 1999 fansite), these had been bought for the movie Into Infinity

Doctor Who 'Nightmare of Eden' has a bunch of silvery jumpsuits that I'm not sure where they originate from; all I have a feeling is they most likely weren't made for this notoriously cheap serial.

 

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Message from Space (1978) - Vic Morrow gets to wear a silver jacket with black lining (including arrows?), as well as some other silver jackets/jumpsuits being seen on-screen.

 

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Megaforce (1982) - nothing more needs to be said, except I have a feeling all these jumpsuits were bought rather than made for the picture.

Bronx Warriors 2 (aka Escape 2000 of MST3K infamy) (1983) - the evil goons wear these silver and black jumpsuits with unfitting motorbike helmets or bespoke made spacesuit helmets, I have a feeling the jumpsuits were bought though

Blake's 7 'Gold' - the guards of the 'ZVP' factor all wear these blue-tinged silvery jumpsuits, worn with hard hats, only altered to have 'ZVP' logos on them

Inseminoid (1982) - simply godawful movie, with so little budget that the 'spacesuits' are silvery jumpsuits worn with, I believe, welding/sandblasting helmets with lamps stuck on? Correct me if I'm wrong as to what type of helmets these are, plus I would like the admittedly know the origin of these jumpsuits.

Yor Hunter from the Future - another infamously cheapo film (well, miniseries originally), the evil 'Overlord' just wears some sort of silvery jumpsuit under his robe and armor (rented from other productions no doubt - the armor could be from the Ator movies originally), with his underlings (ones not just in costumes reused from Aldo Lado's Star Wars knockoff 'The Humanoid' a few years earlier) wearing more translucent white versions - they seem to have been altered to have tubing on the shoulders but otherwise? Where are these from originally?

Again, would like to know what exactly these outfits' original purposes were, especially as they were found in often low budget productions so most likely were not bespoke made! Where they racing outfits, fire hazard outfits, or? I'm not knowledgeable on my hazardous/racing wear.

Also just for fun; this gimmick of silvery jumpsuits became more or less dead in the mainstream past the early 80s in any genre, except for spoofs like in Austin Powers...like the unlucky guard here!