This was the sketch that we made for the cartoon.
All we need to do is add some clothes. The triangles are just a guide. Let them show you how the coat will hang. The triangle that represents the characters left arm says that the left side of the coat will be pulled up and away from the body. While considering the drape of the coat, use the curve tool to draw the bottom edge.
Draw the arms. Here each arm is just two simple lines. The pants are also simple. Make two vertical lines that represent the out side of the legs. Now use the curve tool to draw the inseam. Then, you can just draw some cuffs.