I'm using Amapi 7, regular version. Then the P5 cloth room, then back to Amapi, then a few magnets... It's fun. The base is to start very low poly. I start with 4 splines, upper and lower ones contour to the general shape, and two VERY jagged, lightning bolt style. I then use the Goridon Surface to make a shape. You get a VERY stylized object. I combine it with other shapes I've built this way and weld them, making sure there's no holes. Then I smooth the whole thing (that's why you start with a very low poly mesh). When it smooths, you get a nice draping potential. Then, if the drape doesn't look quite natural, I'll pull it into the P5 cloth room and drape it over a figure in zero pose for a couple of frames. Export it back out, and back to Amapi for a BumpSoften and a little more fitting. If you need any more help with Amapi, IM me.