For a quick fix, you can use the Properties palette to make the offending body parts invisible. For instance if the hip is poking through the pants, uncheck the "Visible" setting for it. Obviously this only works for body parts that are completely hidden by the clothing or are off-camera. If the shins poke through the bottom of the pant leg, try using the scale and taper dials on the pant legs to adjust their shape, or deform them slightly with a magnet. As Phil suggests, the Cloth room also works well but requires a bit more computing power and time.