Something I can imagine a hardboiled Khan to wear, or a seasoned tribal wanderer, something for Papa and and the real MexiCAN, and any vault chosen one.
Dead Money
Honest Hearts
Lonesome Road
Gun Runners' Arsenal
Level 13, Survival skill of 60, Ranger combat and patrol armor, Khan soldier armour, a fire gecko hide and three spare parts. Then you'll be able to craft the whole pack called Rare Species at the campfire. Because spiked knuckles are used as "gloves", it has a "plus 10 to unarmed damage".
There are three helmet variations and Suppository, a unique two-shot double barrel shotgun you might remember from Point Lookout, with custom 2K textures, and a spotter perk (It's an advanced holdout weapon, if you get the joke). Suppository is a private property of Oscar Velasco. He also owns a full set of Khan vet armor cause he's the true Khan gritter.
To get two more helmets you'll need to sacrifice the one you already have, called Long Live NCR, and get Chalk's Hairdress from Honest Hearts. Then Horse With No Name recipe becomes available at any campfire, and you can have the Chalk based version that comes with and without them red sunglasses.
Papa Khan is wearing his own helmet called Wrath of Khans, and his brand new All My Papa garb plus Noble Savage, an automic 10mm pistol modified to shoot 45 auto. If you like Robocop's Auto 9 or Judge Dredd's Lawgiver, you'll love this. If you are using some other mod that modifies Papa Khan, then he might or might not have it, who knows. SHADOW KNOWS. Oh wait, that's a different show. Just put my mod lower in the load order (Same rule for any other mod that modifies any of the mentioned here NPCs).
The only way to get Papa's is to kill your Papa. If you do it you'll be able to walk amongst Fiends unharmed while wearing it, because even Fiends will ask their lucky 8-ball before going loco with someone who, for whatever reason, wears Papa's own groove.
True post apoc outlaw attire with cyber arm, couple of sombreros and lots of different face wraps and eye masks to go with it, for all those casino and caravan robberies. With Wild Wasteland, level 13 and one of the sombreros, MexiCAN, you'll be able to craft the special Dia de Muertos headgear at the campfire. Banditero Outfit itself makes Vipers and Jackals "tolerant" as long as you wear it. Bandidos think twice before shooting such a bandito.
Banditero has Yellow Bastard, a golden magnum shooting golden bullets that don't take shit from anyone, only silver.
All of these new items, with the excepion of Muertos, can be found in the last hidden cache of Randall Clark.
Fallout 2 Chosen One "after credits" sort of armor. It comes with a tribal halberd Roots of Arroyo made out of different poisonous freaks, a cleaver and a golf club and packs the venom of cazadors. And also with a mantis glove that you can wear as a piece of clothes, with any outfit or weapon. You can claim it as your prize from Ranger Stella in the final fight on Legion's arena.
Ranger Stella has a holodisk, a little old fairytale. And vanilla Legendary Deathclaw now has a name, Nergal (Also a custom model now), that philosophically connects it to this tale. Upon its death, collect Nergal's hide. With Survival of 90, level 13 and Head Argument, that tribal T-51b helmet you've found on Stella along with the tape, you'll be able to device the Helm of Nergal. Besides looking like a tribal T-51b with a bloody legendary deathclaw head on its muzzle, it will force deathclaws fear you and not attack you, unless provoked.
(If you want to cheat fate and have both this and the original Head Argument you can either A: open my file in FNVedit, check the ID of the Head Argument and player.additem it in your game. Or D, get this. D stands for Diversity.)
Can You Bear the Extra:
There are two more recipies for the campfire, "Rare Species, Guai Shoulder" and "13th, Guai Shoulder", that add a bear head to their respective armors (Similar to how it is on All My Papa outfit). Their requirements are level 13, 3 pieces of guai meat plus whichever of the two armors you want to add them headie to (Too Weird To Live Too Rare To Die Khan vet or 13th Chosen). The change is completely visual and does not alter the stats in any way whatsoever.
All stuff is included in all form lists, perk lists and grocery lists (As are all weapons you'll find in this mod).
The NVBII version only differs in that everything Banditero (Except MexiCAN which is still in Clark's cache and Muertos is Wild Wasteland) can now be found on Red Bear from that mod. I was playing it and thought this as a true reward for dealing with him. Obviously requires Someguy stuff. You can still use the main version instead while playing NVBII if you don't care about such a relocation.
blueboar for all his stuff in general, but in this case for his eye masks and facewraps in particular.
DcCharge for 2K vanilla textures of most of the outfits.
GaigeStorm for custom 2K for Suppository, based on that cut Point Lookout shotgun.
Millenia for the texture of Noble Savage's base.
sansuni for the textures on Papa's pauldrons.
Quetzlsacatanango for some inspiration, but also for gecko shoulder, and deathclaw snout.
tumbajamba for cyber arm and Jokerine without whom I wouldn't even know it existed.
phoenixhunter1985 for retexture of Elite Riot Gear, parts of which I used for Banditero outfit (Specifically, the coat, the pauldrons and the, umm, the leg pads).
jetacon72 for the vault suit base of the 13th Chosen outtfit.
Vufur for golden texture on the Yellow Bastard, and CyberSpyder for its golden bullets.
SpeedyB, splitSoul and BioClone for everything related to that Tribal T-51b helm's original form.
Last but not least, FiendishGhoul for the textures and part of the mesh I've used to create my variation of Papa's Wrath of Khans headgear. I've found his personal retexture of it in old screenshots and reached out to him, and he was cool enough to dig it out from his file pile and share it with me.
P. S. Not all of the outfits in my mods come with two genders, but all of them come with ability to wear them no matter your gender. As in, if it's a guy outfit, a girl can wear it with a prospect of growing a penis for that moment, and vice versa. This isn't a politichuckle statement, this just works.