I had difficulty visualising the underlying forms of my character at first, so I traced over my previous drawing to get a better idea. I made several versions and tweaked it until it looked balanced.
I found that some of the asymmetrical elements would be easier to adjust in 3D, such as the top hat and hips. When drawing the clothing, I kept some of the lines of the body underneath at a lower opacity so I will be able to refer to it in 3D. I also used different colours so it would be easier to differentiate between objects.