You go to my thread:
Black Desert Online - PAC File Names Relations
and find your Sileshi Underwear PAC File Name: _00_UW_1040.PAC
Then you use
Resorepless nude mod menu option 4 (Get Textures of an Armor)
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and you discover the textures for that file is: PVW_00_UW_00039.dds
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So open that texture with Photoshop or paint.net and edit the Aplha chanel, by adding a black part in the place of the part we want to remove.
So the original texture is like this:
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To remove the upper body part, you should create an alpha channel like this:
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After you are done, save your texture and for that texture in specific, use the compression DXT1 - 1 bit alpha
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(Some other textures you have to save with the DXT5 format, to figure out if it's DXT1 or 5, follow this rule: If the texture file is less than 1MB, it's probably DXT1, if it's greater than 1MB, it's probably DXT5)
Save the texture in the "files_to_patch" folder from Meta Injector Reloaded and run the injector.
Don't forget to place this texture is your "character/texture" folder as well, otherwise it won't work. And be aware if you use Resorepless Nude mod to remove stuff because it might overwrite your texture in the "character/texture" folder.
In some textures, if you simply do this (the black alpha channel), you are going to get a body with a hole in the place where the texture you removed was, to fix that you have to do another stuff, but for this texture in particular, you don't need to do this extra step to fix that, so I will save this for another time, or I can tell you if you are interested, just ask.
Here's the patched texture file, in case you don't manage to do the alpha channel trick yourself: