Difficulty on putting textures in blender

[JoestarNoriaki]

Guys, can someone help me?
I'm trying to put textures on a character that I extracted from the game, the problem is that the texture of the skirt is also on the texture of the pants, when I try to change the texture of the pants, the texture of the skirt automatically stays the same.

I don't know what to do and I can't find any tutorial on how to separate this either, the same thing is happening on the face and eyebrow. I'm lost

I wanted the texture of the skirt to be different from the pants and boots, you know? I wish I could normally choose the textures of the body parts.