Rigging Clothes with Character

I have a character that I gave a loincloth. I have already rigged the character but I do not know how I should go about rigging the loincloth. I tried parenting it to the character rig but that doesn’t seem to help because I want to rig the flaps of the cloth. Any ideas? I tried 2 different rigs and combining the two but the cloth doesn’t deform with the character.

try a softbody?

How would I do that?