Where you call this a body, I'm assuming a figure. Often times, the hip gets moved and that causes the figure to move away from the body. If it's not a person but still a rigged figure it might be called something else. You could try zeroing the x and z translations for the hip and see if it moves back to the body origin. If you really want to move the pivot point use the joint editor and change the center point in the joint editor. But I can't say how this will affect conforming clothing or poses.

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