[REQUEST] Need help with a mesh

[Ezarr]

Could someone please help me with this pant? I want to remove some parts that I don't need. 

 

The part that gets under the top mesh in red, from both front and back side.

 

 

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I tried to do it myself, but the edges of the mesh get all jammed and I want it to be a clean cut if possible.

 

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I forgot to add the mesh lol: WIP.nif

[Ezarr]

*Bump*

 

I still would like to have this done if possible.