Need help with adding bones to cloak

[SeveN085]

I've made a cloak in blender, but Im not sure how to add bones. I've tried with "transfer weights", imported another cloak and tried to copy it's bones, but it didn't work.

 

this is how it looks like

[SeveN085]

I've managed to transfer weights, but the problem is, my exported nif doesn't have BSDisemberSkinInstance block not sure how to fix it

http://imgur.com/a/LvZgC