The 1977 Japanese film "War in Space" used helmet designs that are near exact copies of the "2001" helmets! This is years before Peter Hyams' "2010 The Year We Make Contact" or "Titan Find".
The "War in Space" helmets even have the computer modules around the back!
The "War in Space" helmets are wider and more bulbous than the 2001 originals, but many replicas (such as the Twinch Squad sixth scale figures) make this same mistake.
Even the chest pack is a simplified and stylized version of the "2001" Discovery suit pack.
Many more recent film and TV space suits would feature similar designs such as the suits from "Mission To Mars", "Star Trek Enterprise", and most recently the Viper Pilot flight suits from "Battlestar Galactica". Even a couple of episodes of "Babylon 5" featured a "2001"-inspired design.
Mission to Mars
Star Trek Enterprise
Battlestar Galactica flight suits
"Titan Find" was sort of a legend in the '80s, because the film books and magazines always repeated, in hushed tones, how the film had "reused the spacesuits from 2001". This of course is obviously not true. The suits are INSPIRED by 2001 (the helmets specifically). But they are quite different.
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Klaus Kinski's character wears a suit of different design. The helmet kind of reminds me of an old James Olson/Catherine Schell film called Moon Zero Two.
The character "Bryce" wears a leather racing jacket reminiscent of the film "Planet of the Vampires", which is one of the spiritual ancenstors of "Titan FInd" (aka they also ripped it off in addition to "Alien" )