The photograph -- which may never before have been seen by the public, RR Auction says -- offers a glimpse of the future wife of Prince Charles lying down, perhaps on a bed, wearing a light sweater or top.

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He's wearing a ratty blue sweater with a light brown T-shirt over it and the collar of a shirt spilling out over the top of it all.

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For a casual spin, Mr. Peskowitz suggests a white T-shirt or light crew-neck sweater and white leather sneakers.

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