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I've seen most of the time Astronauts and/or Cosmonauts wearing blue coloured clothes either on Earth or in the ISS. Is there any specific reason for the choice of this colour? I think it's to show that we are from the Blue Planet (Earth).

enter image description here

Image Source: This Quora Answer

The Quora Answer linked above doesn't explain the reason for this choice.

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    $\begingroup$ I don't think the colour has a practical use. The jumpsuits might purely be for aesthetics or to associate a certain colour with a certain mission. All shuttle astronauts wore orange jumpsuits during launch and re-entry because it stands out against the surrounding environment if they were to be stranded. But I don't think they wear blue for a reason. Might as well ask, "why am I wearing a green t-shirt today?". The answer is because it's the first thing I found and it doesn't look bad :) $\endgroup$
    – Star Man
    Oct 28, 2019 at 20:14
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    $\begingroup$ The orange suits weren't jumpsuits, they were pressure suits. These blue flight suits are mostly worn when flying in the T-38s or for PR. They weren't worn in space at all, to my recollection. $\endgroup$ Oct 29, 2019 at 0:01
  • $\begingroup$ @OrganicMarble, They were indeed worn in space and are currently worn during special events (post-launch, hatch closing, etc.). See this webpage. $\endgroup$
    – Vishnu
    Oct 29, 2019 at 15:26
  • $\begingroup$ @Intellex those aren't the same blue garments in the picture from the ISS. Those are Russian-supplied garments. Note the national emblems across the chest, not present in the NASA garments. $\endgroup$ Oct 29, 2019 at 15:27
  • $\begingroup$ @Intellex they have a large national emblem on the chest that is not present in the NASA garments. In the front row you see a Canadian maple leaf, a Russian colored stripes set, and a USA emblem of some sort. All this is missing from the standard flight suit. $\endgroup$ Oct 29, 2019 at 15:28

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In the ISS, they don't wear blue clothes only :

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There seems to be a preferation of khaki pants, but there is one in light blue too.

Sorry, I found no information about the deep blue jump suits worn on Earth.

Another orbit image added by Organic Module:

(not even in the shuttle)

enter image description here

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    $\begingroup$ Fine :D ; Just include "most of the time" in my question. $\endgroup$
    – Vishnu
    Oct 28, 2019 at 16:50
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    $\begingroup$ Many thanks to Organic Marble for the very cool picture. $\endgroup$
    – Uwe
    Oct 28, 2019 at 18:24
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    $\begingroup$ If you're that far above the clouds, sunglasses are entirely justified! $\endgroup$ Oct 29, 2019 at 3:37
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    $\begingroup$ I found another image with pants in black and dark blue, but I hesitate to add it. $\endgroup$
    – Uwe
    Oct 29, 2019 at 10:14
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    $\begingroup$ @Intellex branding most likely? Just like how SpaceX astronauts will likely wear spaceX suits and Roscosmos will wear Russian suits; NASA will wear blue tell-tale suits (honestly, probably, because the NASA symbol is 90% blue). $\endgroup$ Oct 29, 2019 at 14:54

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