Multi part skeletal mesh does not completely follow animation

Can someone please help? I attached new screenshots that show the mesh deformation better and also a screenshot of the construction script of my character BP. Why is the trenchcoat so deformed at the bottom. It works fine when I use the trenchcoat as the main mesh and make the other meshes follow by using set master pose component.

https://dl.dropboxusercontent.com/u/9261365/b1.png

https://dl.dropboxusercontent.com/u/9261365/b2.png

https://dl.dropboxusercontent.com/u/9261365/b3.png