My rig actually works good, except for one part and I dont understand why.
Her jacket moves, when i tilt the head. I dont know how to fix it. The method i used to join rig with body is selecting mesh and rig and then press Ctrl + P and click on Automatic Weight
Here are the pics:


Automatic Weights. The bone that moves the head has influence on the jacket, you can fix it with weight painting. – mqbaka mqbaka Jan 19 '22 at 06:08