Hi there! If you take a look at your diffuse and your arm and rgb masks, they look significantly different. The top parts need to be in the exact same place, otherwise you will get strange colors and transparencies like it is happening to you.
You can create both the ARM and the RGB map directly from the Diffuse map so that they are not mismatched.
To create the ARM simply open the diffuse in an image editor and paint the clothing parts in any color between green and orange. Orange is very shiny, green is not shiny at all: choose depending on the finish look you are looking for.
To create the RGB Mask you can follow the steps in this tutorial. It’s simple!
Let me know if this fixed it for you 