Blender -> Apex -> Unreal Engine4 cloth bugs

Hello There. The problem is in some stretching of the cloth part of the mesh, after using Apex. First of all i have created simple object with armature, and make everything like in the lessons. It works great in Apex, but when i import it to UE4 something strange is happening, i can’t even know how to describe it, that’s why here are the photos.