Dangling cloth rig (skirt, coat, etc...)

Hi guys, I’m in the process of modeling and rigging a character that will be imported in the Unity game engine.
The overall rig is looking fine (I hope), but i can’t find a way to properly animate the skirt/kilt.

Googling I found:

  1. Cloth simulation, that i’m afraid it will be heavy and a pain to port in Unity
  2. Create a rig that helps controlling the dangling cloth

Since I’m not sure which approach is better I’m wriiting this post to ask for suggestion and tips, keeping in mind that the game will be a RTS (many units on screen at the same time).

Here is a picture of the model:

Thankyou in advance.