Hey guys I want to know how to set this workflow correctly, I have two vellum pieces set as picture below, outer pieces like cloth and inner is human soft body, the "vellumobject1" node is default state and geometry and constraint parameter is blank, "vellumsource1" and "vellumsource2" link to "B_geo", "B_con"; "C_geo", "C_con" separately, and when I pressed play button, the cloth edge will shrink and not keep it original position.

If I change to use pin constraint type, it will work for this project target but I want to figure out what`s wrong with my setting.