They only work with armors, e.g. like I did with the uniform, it can't be done well as a separate cloak unless on the newest client. You have to set values like I do in armorgrp.dat. you can attach the cloak to other uniforms, as I did. Maybe it will be useful to someone on the server as a Uniform + Cloak
Have you copied my armorgrp.dat line to your H5 client? Have you added files and you have a static cloak in the game? I have just checked and what I have provided is working correctly in the client console.