You have lots of different options. One is to try softbodies on the coat. Another is to put bones in the coat and add spline ik and animate that. Also you can create a bunch of clusters, sculpt and wire deformers and animate them. Another is to create a bunch of blend shapes and put different set driven keys for different motions so the cloth will deform one way or another.
Deke Kincaid
deke@mail108.pair.com
deke@littlegreenmenstudios.com