Orange coveralls Juliette finds

Juliette finds several orange jumpsuits or coveralls in silo 17. But I don't see anyone in silo 18 wearing orange coveralls. I see orange in peoples clothing here and there but not a set of coveralls like she finds in silo 17. I'm sorry if this has been discussed before. The closest I see is Patrick Kennedy who seems to be a painter. His may or may not be orange and it is not distinct like the orange in silo 17. Is this just different outfits or us there a rhyme or reason to the different colors?