Yes, I can confirm the cloaks actually aren't visually there even when you equip them on OSX. Not sure why, or how it would be difficult to fix this considering the 4 million dollars raised to develop this video game. I am much more disappointed at the fact that there is still no answer, or feedback from the devs on this situation. I read somewhere that the software used for the capes is NOT supported by linux. Although I have read in this thread as well as other places on the internet that it is supported by both windows and OSX.
please return some feedback devs, it would be greatly appreciated.