item box→change appearance→change all

You have to be change all，Because NPC clothes are not separable

Pl067_0000 (this is the samurai)
Pl076_0000 (this is harvested)
In theory you can change the name to the number you need to change (the folder contains the number of the file inside):
For example, the diver, the god of death and the like (for details, please refer to the clothing code of other posts, I am not sure)
We have specially repaired the chest wearing mold BUG, it is estimated that there is no problem in directly changing the number.


Samurai armor
Layered armor sets will change the look of your armor without changing the properties underneath. Equip this Samurai set over your favorite armor to take on the  appearance!
Note : No weapons are included with this set


Installation:
Unpack the main archive (with folders) into Steam\Steamapps\common\Monster Hunter World\
You can then unpack the optionals to the same location and overwrite.

Uninstallation:
If you want to revert to the original, simply delete the mod files and folders in these locations:
\nativePC\npc\npc026
\nativePC\pl\f_equip\pl067_0000



Pumpkin armor

Installation:
Unpack the main archive (with folders) into Steam\Steamapps\common\Monster Hunter World\
You can then unpack the optionals to the same location and overwrite.

Uninstallation:
If you want to revert to the original, simply delete the mod files and folders in these locations:
\nativePC\npc\npc026
\nativePC\pl\f_equip\pl076_0000



Thanks to Vuze for the unpacking tools, daemon1's raw texture converter (correct offset can ungarble TEX, correct values
are usually around 100 to 118),  MHWTexConvert for converting DDS to BC7
and MT Framework tools by Predator for allowing me to see the UVs.