I largely made it up as I went, with the objective of making the cloaks mostly obey gravity. Something they, for that matter, don't even properly do in the original Knightly Orders box, but rather flutter like they'd either be feather light or the knights ride at blazing speed. I suspect it's because the cloaks doubled up for Mordheim and had to look good on infantrymen too.
I started off cutting the cloak just above the feline head, glueing the top bit to the shoulders of the knight, then worked my way downwards from there. There was quite an angle between that topmost and the next bit, to get the cloak to wrap around the shoulders properly. Then I added piece by piece, letting the cloak fall almost straight down, then bend horizontally and flow along the back of the demigryph.
I didn't use any support, the pieces had enough contact points and edges to stay together with the power of superglue. The gaps and the contact points/edges were then greenstuffed over. What surprised me was how different the three of them turned out, despite all using the same cloak bit.