My take on the LORE reason for the jewelry:
200 years ago Mr. House used part of Vault 21 for secret Robco research into stealth technology (It could happen). When he came back on-line one of the first things he did was have the secret research laboratory and nearby sections filled with concrete. But Mr. House was too late. House did not know that the research had produced some prototypes. A young doctor named David Mitchell had found the stealth jewelry. Unaware of their special properties, he brought them with him to GoodSprings when he and his wife left Vault 21.

This mod is made to compliment (Blatant Plug!)
Sneaky Pete's OWB Mark II Stealth Jewelry 
Sneaky Pete's Sexy Clothes 
Sneaky Pete's Classy Clothes 
Sneaky Pete's Tomboy Trait
NOTE: A player can wear a necklace and a choker at the same time

All jewelry items are located in a First Aid Box on the wall of Doc Mitchell's house near the exit.
I have given you several choices so you can wear your favorite armor or clothes and turn them into stealth outfits

There are 8 pieces of jewelry; The first 4 items give the player +100 Sneak and Stealth Field While Sneaking

1) Sneaky Stealth Choker 
2) Sneaky Stealth Earrings 
3) Sneaky Stealth Ring 
4) Sneaky Stealth Necklace 

The next 4 items are marked OP (Over Powered)
They also provide the +100 Sneak and Stealth Field While Sneaking
In addition they raise skills: 
+25 Sneak 
+25 Guns 
+25 Energy Weapons 
+25 Explosives 
+25 Energy Weapons

5) Sneaky Stealth Choker OP
6) Sneaky Stealth Earrings OP
7) Sneaky Stealth Ring OP
8) Sneaky Stealth Necklace OP

Requirements: NONE

If you like a mod, please endorse it.

Check out my other Nexus mods: 
Sneaky Pete's I Hate RadRoaches
Sneaky Pete's Delay The Frontier
Sneaky Pete's The Frontier Holo Vendor In The Lucky 38 Suite
Sneaky Pete's The Return Of The Son Of The Lucky 38 Suite Mod
Sneaky Pete's Aircraft Pin-Up Load Screens
Sneaky Pete's MORE Sexy Clothes
Sneaky Pete's Sexy Clothes
Sneaky Pete's Classy Clothes
Sneaky Pete's Uber Weapons
Sneaky Pete's Buttercup Companion
Sneaky Pete's Frontier NCR Exiles Disguises
Sneaky Pete's OWB Mark II Stealth Jewelry
Sneaky Pete's Stealth Jewelry
Sneaky Pete's Tomboy Trait


I would like to give a nod of thanks to scarlettcarson for the idea
Thanks to Exeter for permission to use meshes and textures
Thanks to Crayne for the first aid box
And, as always, thanks to Sensei SweetKitten for Geck help