Hey. Well, after two days, I found out that each time when I mapped this pant into new UV-Set, the UV's were not working. Finally, I tried to map it by checking off the "Map into new UV set" thing, so it got directly to map1, and it worked.
When I mapped the textures into for exmaple "PantTexture", and attached a shader with texture, the texture was still on "map1", even though I had activated "PantTexture" UV's. As you can see in the pictures above, The UV's are from set "PantTexture" are shown in the UV texture Window, and the texture in the background are texturing "map1".
As i have little-to-nothing experience with texturing, I don't know why this happened.
Thank you for trying to help me =).
(Here's the character after a little texturing, now I'm off to build some skeleton on him)