To my thinking, there was something in him that made it hopeless to attempt to disguise him. The more I dressed him and the better I dressed him, the more he looked like the slouching fugitive on the marshes. This effect on my anxious fancy was partly referable, no doubt, to his old face and manner growing more familiar to me; but I believe too that he dragged one of his legs as if there were still a weight of iron on it, and that from head to foot there was Convict in the very grain of the man.
– Charles Dickens
Great Expectations, Chapter 40. All Pip can see when he looks at Magwitch is the convict. No amount of clothes that he has ordered for him to wear can disguise that. Pip believes it is not possible to make a gentleman out of him. That is emphasized by Pip’s use of a simile comparing Magwitch dragging one of his legs to someone wearing a leg-iron. The quote highlights the theme of deception and people trying to hide who they are. It also illustrates the theme of justice and the law.