https://imgur.com/a/Ort6q53 -- Also posted to r/whatisthisthing.

Here is a uniform that was given to my dad by an acquaintance who claimed to be KGB. Is this likely given the uniform is Signal Corps? I would guess that there is no way to tell, but is there any evidence for or against his claim? Could the lapel or epaulette decorations* suggest so? Unfortunately, the guy probably kept the cap and impressive/identifying awards if he had any. I found a lot of shops selling Soviet uniforms and decorations, but no resource cataloguing their purposes. Does such a directory exist?

Secondly, what was the purpose of the "Young Guard" and "Warrior-Athlete" pins? Were they only available to members of Komsomol or were they awarded from the military? Is the "1" pin different? It seems less juvenile than the rest. Edit: solved, yes. ( http://giftsgalary.ru/product_info.php?products_id=1750&osCsid=ded579b24b2719e6c8382096ab02f673 )

There is also a Russian word written on an inner pocket I can't translate. It's probably a unit name or the owner's name, or something else for the washing service. Surname and division number. Seems to confirm attachment to KGB division: ( http://shieldandsword.mozohin.ru/kgb5491/troops/ss/08.htm )

*shoulder board gold riffraff means Senior Sergeant.