ImmortalSin
MrScratch
BadMadScientist

Install Instructions
1: Extract this archive.
2. Copy the files of the folder "SaintsRowIVFPV" to SRIV install folder :
...\steam\SteamApps\common\Saints Row IV\
3. Launch Saints Row IV and enjoy!
Usage
Run the game, go to PLANET ZIN and outfit yourself with "FLUR MASK" necklace (which now can be found in Headwear section).
You can change your character's clothes like normal (just don't choose any hats, glasses or face-wear) and then see them during movement. Beware of clipping issues though! Clothes with high collars are usually getting into way much more often than the rest.
Credits
Big Thanks to MrScratch and BadMadScientist for all of the help!
Coop notes
In previous versions, every player - a host or a guest, it didn't matter - with FPS mod enabled would end up seeing coop partner headless. Right now, however, any character's head will turn invisible only if that character is wearing a "FLUR MASK" long chain. Can't see your coop partner's head (and know that he or she isn't using FPS mod like you)? Just ask him/he for removing the Flur Mask necklace from his character!
Updates
Version 0.2

    Replaced player weapon animations, player will now hip fire unless you use fine aimming.

    Updated cameras for the bigger weapons (Dubstep Gun, Bounce etc).

    Fixed Dubstep Gun Camera (still a work in progress).

    Updated Super Jump camera.

    Minor overall camera tweaks.

Version 0.25

    Improved Dubstep gun. Gun is now usable, and much better then before. Progress 85% Complete