Help Add clothing to Humanoid Character

Hello I am building a game where the character clothing can be swapped.

I am using a humanoid avatar for my character, and I had a 3D artist weight paint the clothing in blender to my rig.

When i change the avatar to generic, the clothing fits and moves around with my character perfectly.

However I need to use a humanoid avatar, This is causing the clothing to not attach properly to the model.

I've watched many youtube tutorials and tried different scripts such as

https://forum.unity.com/threads/tutorial-how-to-make-clothes-animate-along-with-character.475253/

https://forum.unity.com/threads/making-swappable-armor-clothing-for-rpg-game.125995/

But these are not working for me.

 

I think this suggest the rig did not conform to mecanim humanoid standards. I not sure best way to resolve that, but if I am right that might help you rephrase your search and find better answer.