Download link - https://assetstore.unity.com/packages...
Dynamic Bone applies physics to character's bones or joints. With simple setup, your character's hair, cloth, breasts or any part will move realistically.
Features
Very easy to setup, no programming required.
Fast and stable physics simulation.
Works with Mecanim and legacy animation.
Support all versions of Unity, from Unity 4 to Unity 2018, mobile friendly.
Full source code included.