Garment Cropping from mannequin

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I have two images – mannequin with and without garment.

Please refer sample images below. Ignore the jewels, footwear on the mannequin, imagine the second mannequin has only dress.

I want to extract only the garment from the two images for further processing.

The complexity is that there is slight displacement in the position of camera when taking the two pictures. Due to this simple subtraction to generate the garment mask will not work.

Can anyone tell me how to handle it?

I think I need to do registration between the two images so that I can extract only the garment from the image?

Any references to blogs, articles and codes is highly appreciated.

Thanks