Is there a way to acquire the brotherhood of steel uniforms? I have a set for the scribe where I looted the hat off a Supermutant and the fatigues off a corpse early on at the police station, but I'd like to get my hands on others- particularly the hats the squires wear, it reminds me of a M42 pattern field cap.

just have to find a random BOS corpse with one on it I think, the BoS vendor might sell one, I didn't check however.

I'll have to check the provisioned then. That's a shame I wanted on of those squire hats. I doubt they are kill able since the three of them are about 10 years old.

I don't think the squire clothes are obtainable at all. The squires are children, so there aren't advlt models for the clothing. There's a mod that lets you use the outfit, but it looks weird.

As for the regular uniforms, Proctor Eamon sells the orange variant at least. I have yet to find the dark olive version in the world. The black uniform can only be found with Paladin Brandis.

Well, you can raid the Airport and take the uniforms off anyone you kill.

They don't even seem to hold it against you long term (every time I go back they wait for me to open fire before shooting me).

I just want the hat. Or at least a version or the script cap without the hood.

an easy way to get a lot of them:

The hood you can get after completing a certain quest by killing a certain someone for the brotherhood of steel. Also, the vendor on the prydwin sells regular outfits.

If you mean just the regular orange BoS uniform, I believe Proctor Teagan sells them. I've found a couple on dead BoS soldiers though. As you progress through the game, encountering BoS soldiers as they're engaged in various battles becomes a lot more common. Some of them are bound to die. I've gotten a ton of T-60 power armor this way as well.