How can I transfer the meshdata from a body to a shirt?

I have a 3D character that is currently only upperbody free. It should get a shirt, but the shirt itself has no bones.
How can I copy the mesh data from the upper body to the shirt in such a way that the shirt moves when I move the bones of the body, as if it were the current naked torso?

The mesh date from this upper body should be transferred to the shirt, so that the shirt moves 1:1 when I move the bones from the character in the pose mode.
But Currently it is not working and I dont know how can I transfer the mesh datas from the naked body to the shirt?:

You can parent the Bones to the Shirt just like you did with the body with Automatic Weights.