Blender 2.8 problem with textures and or materials

I’ve been learning blender for the past two weeks, yesterday I was playing with textures and materials, I tried a few like leather, cotton and stuff like that for the pants of the character I’m making, I did not like the outcome so I deleted everything and saved the proyect. Today I watched a few videos to understand more how this works, proceeded to download a few fabric textures to try the same thing again but this time with more knowledge, to find out that something is messing with the textures of my character. I created a new proyect and added the textures to the default cube to see if I was doing the right thing and it worked perfectly. I can’t get rid of the colors/textures/materials I have on my character, any ideas on how to do that?

Thanks in advance.

P.S I have attached a couple of photos in case it helps.

This is how my character looks like with the texture:

This is how it should look like: