
Working on it... something just doesn't go right
because you're going about cape motion the wrong way
neato little trick with animation billowing fabric

draw out a looping sine curve in the direction you want movement to go, then move it X amount in that direction per frame, and then use the curve to draw the shape of the cloth--when the curve gets to a frame where it loops back on itself, you have a nice smooth animation
that's exactly how i made the guts animation a page back, so you already have a visual reference of how the method can look in motion