Transfer Mesh data to selected vertices on the target object

I had a situation where the rigged character had clothes shared with other mesh islands. And I only wanted to transfer weightpaints just on the shirt itself. I find that there's no options to only effect that island selected. My only solution is to seperate the island and rejoin it back in after transfer weightpaints. But that solution is very bad since it effects verties ID and prevent from copying VertexGroup data blocks.