Hello Guys! 
1) Open the OPEN IV application
2) Click "Edit mode"
3) Drag & Drop the files into the path location 
Jacket: Mods\x64v.rpf\models\cdimages\streamedpeds_mp.rpf\mp_f_freemode_01
Leggings:Mods\update\x64\dlcpacks\mpgunrunning\dlc.rpf\x64\models\cdimages\mpgunrunning_female.rpf\mp_f_freemode_01_mp_f_gunrunning_01
4) Done & Enjoy!
P.S ( This can also be used for MP female just click on mpimportexport_Female.rpf to install for MP Females)

For questions or if you need any help Dm me on Instagram @HoneyBrasi