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If "they're our university colours" was the reason, they likely would've said so when asked. Even if that was the reason when the outfits were chosen originally, that isn't the reason they gave when asked.

Or they just don't want to violate laws back home and made up an excuse

I think it’s more plausible than the number of people who’d have to be involved making custom jumpsuits and sneaking them onboard.

According to a follow-up article by the same news outlet this tweet is the correct explanation. I'm not going to make judgement because I don't have enough information to decide either way

https://www.cp24.com/mobile/world/russian-cosmonauts-suits-a...

I choose to see that as plausible deniability.

But then there's also a great big russian flag worked into the suit.

But then there's the 'why didn't they say it was college colours?"

Who knows?