Finally found something on the Darkstar helmet/suit:
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Costume designer, Marlene Stewart: "General Issue flight suits, uniforms, whatever, they're not great. I mean they're fine for, you know, the average person, but obviously for our hero, Tom Cruise, everything was custom made. All his uniforms, all his flight suits were cashmere lined,. We wanted to get the scale right, better quality fabrics...
of course, the space suit for the Darkstar was all custom made and had to be fully functioning like a real space suit...reproducing an iconic image that everybody knew...and getting it to look like all the designs, that they fit Tom perfectly... everything was custom made."
https://webcache.googleusercontent..../movietalk/90255260&cd=22&hl=en&ct=clnk&gl=uk
https://www.instagram.com/ironhead_studio/?ref=Instagram Panda&hl=fi
The Jose Fernandez built Darkstar helmet:
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Jose was also the person who put the helmet on Tom in the film:
Jose is that you put it on him in the film? I thought that was you. But am I mistaken?
@ironhead_studio?
@lorenzo_lofatyup
The socket that's missing on the back of Fernandez' helmet is referred to as "Take-Up Assembly".
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I had to search to find what that meant: "take-up assembly to more positively position the pilot's head within the helmet."
https://www.cia.gov/readingroom/document/cia-rdp75b00159r000400140040-9
So, the suit and helmet were inspired by the real thing, but due to the necessity of movie magic were custom designed so that "they fit Tom perfectly."
That same movie magic that allowed Maverick to survive ejection at Mach 10.3.
Or allowed him to steal the Iranian F-14, because according to the Goofs on IMDB "The connectors for the F-14 and F-18 oxygen masks are very different. So Maverick and Rooster wouldn't have been able to connect their air hoses or radio mics, and would have had to shout at each other (if that has even worked). This would also mean their G-suits would be inoperable."