Getting all three faction armors in one playthrough

[A_Clever_Monocle]

Is it even possible to loot them and can it be done without turning oligarchs hostile

[cypherusuh]

AFAIK no. It's only available on their shop. Although I haven't rummage all their cabinets, since usually it requires very high stealth to even passed their receptionist area

[Sfzrx]

I think it might be possible, choose JKK faction, then you can kill the praetorian guards in lower passage entrance with mines or something, then there is a coretech guy outside the institute, attacking him won't make the institute hostile but everyone else will, however I haven't tested whether this will turn core city hostile or not. And finally I believe you can always go high pickpocketing and pickpocket the armor?