You'll need to install menyoo

https://www.gta5-mods.com/scripts/menyoo-pc-sp



Simply move the XML files into here:
Grand Theft Auto V\menyooStuff\Outfit 


What are these outfits even about anyways?
These are Outfits I've had back in the old generation back on Playstation 3 and Playstation 4 back in the day and wanted
to bring these Outfits to PC for the sake of history purposes.

Back in the day i would never change my Character's Outfit and would only stick to like 1 or 2 outfits during those in the day.

Mark 2 Outfit was created by a Friend/Fan and i decided to bring that here on PC aswell.