Some of the Ranger casual garb is not faction aligned. My Idiot/Savant Cowgirl has been wearing ranger neckerchief gear lately. She actually thinks she's a real Ranger. (BTW, if you haven't played a 1 intelligence character yet, you gotta go to Helios One and battle wits with Fantastic. Oh. My. God. funny).
On another note, I haven't tried this yet, but if you are wearing, say, NCR Mantle armor, and your rep is set to neutral, and you do a few things to gain rep, does your rep, while wearing the armor, go up? I know that I snuck into the Fort once while vilified by the Legion while wearing Legion disguise and once I started killing the football team, I kept getting the pop-ups about my rep going down from neutral until I was vilified again, but while wearing the disguise. Do you guys think this works in reverse? Has anyone tried it?
-Gunny out.
Yeah, but the Ranger casual garbs don't provide much DT.
You can get reputation changes while wearing faction armour, or at least negative changes, since I never wore one long enough for any positive reputation changes. The thing is, if you get vilified by, let's say the Legion, while wearing NCR armour, the moment you take off and re-equip the NCR armour (or any faction armour) your reputation with the Legion becomes neutral again, but you should still be vilified by the Legion if not wearing any faction armour.
So your "true" faction reputation only takes effect when not equipping faction armour, wearing faction armour resets your reputation with major factions (probably just NCR and Legion) to neutral whenever you equip them.