Why is mesh deformed in unity but in blender it looks ok?

When i export my rigged character from blender into unity his hoodie gets deformed (only hoodie, other meshes behave right). I checked out weight paint but i think there is no problem with it. I keep clothes and body separately and when it comes to animation i just add to the body data transform (masks) so that clothes can move along with the body of the character. I dont know what went wrong and i dont want to redo his animations again...Please help, i dunno what to do :(((