https://www.pcgamer.com/monster-hunter-world-mod-lets-you-transmog-your-armors-appearance/

Monster Hunter: World has done the series justice on PC, but it is missing some popular features, chief among them the ability to transmog armor: changing its appearance to another armor set, while keeping its stats. Alas, transmog was added in Monster Hunter XX, which hasn't been announced for PC and probably never will be. Luckily, the PC does have modders—more specifically, modders like FineNerds, who's gone and created an armor transmog mod for World. 

As FineNerds explains on Nexus Mods, all you have to do is download the mod, open Monster Hunter: World, open the mod, and "enter the armor you want to switch to." I was skeptical, so I decided to try the mod for myself. And while it's not quite that simple, it does work and it is very easy to use. Let's start with a look at the interface: