How fix Blender weights problem?

Hello. I want make chair with stretching cloth:
image
The problem, is that cloth if wrongly stretching:
image
But I want smth like this:
image
There’s how verticles placed, and their weights:

(Seat) . . . (Back)

Can someone say me, what’s wrong with this skinned cloth?

Did you check your armature? If so i have no idea how to help

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Armature consist only of 2 bones - back and seat. Every affected vertex have behaviour of 1-weighted, even if I paint in to 0.1. 2 bones haven’t any crossing vertex

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I found 3/5 solution - just add another one “Root” bone, which have every vertex weight set to 1.

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