Make 2d Items animate along with character's bones and mesh

Hello! I have a 2D character with bones and meshes. I want to make items attached to the bones and meshes, but I couldn't find any good way to do that.

https://i.gyazo.com/62147e3b878a76baa47026d5f1ce90c0.png

For example: A shirt's sleeve would move with the character's hand and the mesh (So there'll be no need to split the sleeve into a forearm and upper arm piece).

What I did try is a normal attachment to the hand, which works fine,

But as you can see in the following video, when the forearm is moving it doesn't get affected: https://i.gyazo.com/2512491659eb2c98f334ec5507732f49.mp4

I found a tutorial by TwoTen on how to do exactly what I'm searching for but it's only working with 3D objects and I wonder how can I accomplish the same with 2D.

Thank you very much!