Assassin's Creed I texture modding HELP NEEDED

[HecuMarine]

Hi everybody. I am the creator of the mod Assassin's Creed Overhaul ( a graphical modification that aims to improve AC1 visuals) and I have a problem which I cannot fix on my own. The problem is I cannot make certain texture transparent :sad: . The texture I'm talking about is Altair costume in certain sequences. What I want to do is to remove a part of his robe tail but it's not possible. When I apply transparency to this texture, the part I made transparent is very shiny and still visible. I heard it might have something to do with alpha channel but I don't know. I used Paint.net and succesfully made transparent textures for my mod. But this one is not possible for me. So I ask how to do that ? I saved this image in all formats possible. I will show you some screenshots if you won't understand what I need.

Edited November 24, 2014 by HecuMarine