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No need to feel embarrassed, we've all been there.

Open the image, in this case a man with a shirt and make a selection of his shirt

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Press CTRL+J the place the selected shirt on his own layer

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Add an adjustment layer brightness/contrast

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Clip that adjustment layer to the shirt layer so the changes will only affect the shirt layer

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play with the sliders until you've got the result you want

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Note: this is one of the ways to do this as in PS there are many ways to achieve the same result.