Hi, You need to delete all the vertex groups of the bones that are not needed for the bra weights.
Your image suggests that you add the upper arm weights to the strap which is why it is moved to words the arm direction.
You also need to make sure you are in the rest pose when paint weighting.
Have you tried the automatic weights?
Look at the screenshot:
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I think I fixed the problem by deleting the vertex groups as u said, but now I have another problem…
When switching to pose position it looks like this:
Hi again, so it looks better but you need to add weights to the shoulder vertex group in order for the strap to follow. Now it could be that is quite a common problem that the skin/body mesh weights are different then the bra weights if the adding of weights to the strap shoulder doesn’t solve the problem then you needs to look into creating shape keys for adjusting the strap. You need to search for shape keys tutorials for that. Or adding bones just for the strap which required advanced level of rigging skill.
Will add some tutorials links. good luck.
https://www.youtube.com/watch?v=-JSFcSxsaTs&list=PLdcL5aF8ZcJv68SSdwxip33M7snakl6Dx
https://www.youtube.com/watch?v=C7N7BP-j2rY
The thing is, in the optimal circumstance, you don’t really need to rig the bra. But the biggest problem in your case is actually on the body mesh you’re currently using. I tried to apply the bra on my 3D model, and it works perfectly without even a rig applied to the bra.
You’ll still need to apply shape keys to make it perfect for a final render/shot, but until then it’s perfect for most cases.