How would I get the ranger hat and clothes from NCR rangers without killing them. Not the patrol armor but the civilian clothes. I dont want to kill them because this is my NCR character. Any ideas? (Console BTW)
You'll have to reverse pickpocket armor and head gear that has higher DT values than what they wearing onto them, so they'll equip them. Then you can pickpocket them again and take their outfits from their inventories.
Save frequently when trying this - high Sneak (and Stealth Boys) will be your friends.
Other than that, rely on nearby creatures or other hostile NPCs to do your dirty work for you, then loot the corpses. You won't lose reputation or karma.