There was a mod I used to have for FNV but I can't remember the name. Sadly all I DO remember is that you can force a companion to wear what you want, even if it is worse than the armor they are wearing and that it was on the Nexus. If anyone here knows it I'd greatly appreciate help in finding it. Sorry that I don't remember more to be more helpful :/

TRY THIS ONE:

the mod makes the default companion armor/clothing "playable" so it means you can strip them then make them use any armor/clothing you want. There's also an optional file that makes them wear faction armors. Cheers!

Another one that is designed to remove the armors so that you can install the ones you want. However it is for Mikoto.. that is designed for it. Don't think it matters though.

http://www.nexusmods.com/newvegas/mods/36220/?

There is another one but I also can't find my backup and remember the name. It was quite good if I remember correctly.

Thanks for your guy's help, I was able to find it by changing my search words, turns out the mod was Pick Companion Armor and Weapons:http://www.nexusmods.com/newvegas/mods/46080/?