Still yet to make the costume, but....
Since I have made Fate's hair ribbons (from Nanoha) which are pretty much similiar to Rachel's, expect they are a lot smaller and point in a different direction. I've decided to scrap the method of using hemp and use the same method like I did with Fate's ribbons which gained some success!
I'm pretty much happy with the result as the rabbit ears maintained their shape and secured on the wig.
This is the first time I tried on my Rachel wig and I just realised that fringe needs cutting as it hides my vision and Rachel's fringe is short, so will cut it for accuracy.