How to pin the selected bones ?

how to pin the selected bones so that the fabric does not fall. That is, add a physical animation like a chain, only on the fabric. The option with simulation is not suitable becouse it is a comiflage net and thare will be a lote of leafes
I want to make when a character moves near camouflage net, touching net, net will be move


Here is an example. How to set up in UE to make the cloth move when the character passes through the cloth?