The collision is handled by the Physics asset in the engine. The “tubes” that kinda represents the bones is the collision. BUT, you everytime you modify size/Rotation/location etc of these tubes, you gotha create the cloth piece over again since collision detection for the cloth is made with the pshysicsasset how it was when you created it…
Apparently is going to change some time in the future, but as of for now, you gotha create a new cloththingy everytime you make changes to the psysicsAsset.