Automatic weights nor applied to cut out costume!?

I cant figure out why reapply automatic weights for the rig is not working for the costume.
Can somebody tell my what goes wrong here.
If i duplicate other faces it is working but it fails for the costume. I duplicate it and used knife on it. Maybe the knife operation messed something up. How can i fix this?


reapply_automatic_weights.blend (339.8 KB)

It works, it just gives you different weights than the body. That’s normal for autoweights, which are designed to slip around mesh edges like you have on the costume.

Here, where the costume is just a copy of the body, you should consider transferring the weights from the body to the costume. I would do that by separating the costume to a new object and using a data transfer modifier.

Thanks, for the hint. Using the data transfer modifier did not work for me.
But i searched for transfer weights and find this video, method 2 and 3 worked, method 3 worked best cause it keeps the cloth near the body.