As Jaager says, the resolution difference is a problem. You might try using the clone brush tool to copy the body texture to the prop a little at a time. I've also tried tweaking the position of the prop to minimize the amount of 'prop' skin visible The plainer the texture (not a lot of highlights and skin variation) the easier to match. Haven't tried it, but I thought of rendering a picture of a shaved body map's hip area big enough to match the size of the prop and using that to get the texture for the prop. You'd probably have to use the same lighting, etc. with the prop though. Maybe some of the people who've created free textures would do some matching textures for this prop.

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