Note: I am not responsible if this gets you banned online.  Etc. blah blah.

That said, I use this online.
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Using OpenIV:


Put uppr_015_r.ydd (Changes normal maps) in folder:

GTA V > update > x64 > dlcpacks > patchday4ng > dlc.rpf > x64 > models > cdimages > patchday4ng.rpf > mp_f_freemode_01 >

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Put the following (Adds nipples to color map) 

mp_fm_skin_f_up_ara.ytd
mp_fm_skin_f_up_bla.ytd 
mp_fm_skin_f_up_chi.ytd 
mp_fm_skin_f_up_lat.ytd 
mp_fm_skin_f_up_pak.ytd
mp_fm_skin_f_up_whi.ytd 

in folder: 

GTA V > update > x64 > dlcpacks > patchday4ng > dlc.rpf > x64 > models > ped_mp_overlay_txds.rpf > 

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Put jbib_015_u.ydd (Turns non-beach bikinis into wrist cuff) in folder:

GTA V > x64v.rpf > models > cdimages > streamedpeds_mp.rpf > mp_f_freemode_01 >


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Wear any Bikini NOT from the Beach DLC and Enjoy boobies.  This includes the black bikini in the shower. Non-white girls may have purple nipple shields, let me know if this happens.